My Casio Collection


Thank you for your great website, and especially to klayymann for posting the 1980 Casio catalogue - it helped me finally identify the F-200 and go searching for one.
A friend at school in 1980 had one and I always liked the square design with round buttons. 28 years later I now have my own that I wear regularly, in fact I use them all.

I can't really remember my first LCD watch, it was possibly a Casio or a Timex, it would have been around 1980. As I continue to look at pictures here and around the internet some memories might be jogged and I will remember (and will then start searching for one).

The following are the Casios I have that I would consider 'vintage', my main watch for years has been the cheapest water-resistant Casio I could find - right now it's an F-91W.

I went looking for the F-200 and through that learned about the F-100, they have damage but that means I'm happy to use them, I do have to constantly remember not to put my wrist under the tap though Smiler
I was cleaning up the C-80 today, there are a couple of keypad buttons not working (Edit: now fixed, I cleaned the contacts under the buttons).
The A153 reminds me a little of my first watch, though it has a chromed plastic case (mine was steel).

I'm not planning a big collection, though I know from other hobbies how things can escalate. Watches I have learned about recently that I might hunt for are the Cosmo Phase and a metal version of the F-200 (QS-24?), though both seem to be expensive.

I jotted down the following from various sources, it might be of use to someone, finding info on battery type took me a while:

Casio F-100 (1977?)
Module 52
Battery - 393 (SR754W, AG5) 1.55V silver oxide

Casio F-200 (1980)
Module 55
Battery - 392 (SR41W, AG3) 1.55V silver oxide

Casio C-80 (1980)
Module 133
Battery - 2 x 391 (LR1120, AG8) 1.55v silver oxide

Casio A153 (1984)
Module 415?
Battery - CR2016 3V lithium

Casio A-200 (1997?)
Module 1604
Battery - CR1216 3V

Edit>> The band on the C-80 looks just like one for an F-200 in the 1980 Casio catalogue, but I'm pretty certain it's a copy. On the reverse it says '805 18mm' and 'Hong Kong'. I've also seen this design band on a Tokai (or 'Tokaj'?) calculator watch too. I'm assuming Casio made their own bands in Japan, I will keep a look out for the correct C-80 one. The band on the F-100 is from a modern F-91W, and the one on the F-200 is a new Casio band with an appropriate design, I don't know which watch it is meant to accompany. *Also trying to call them 'bands' rather than 'straps', I'm not sure it matters but I see 'band' a lot more on the internet.
Original Post
You've got a nice start on a collection there - the F-200 is particularly hard to find. The resin straps always break after a time and some just are not available any longer so finding a reasonable replacement and being satisfied with it is the way to go.

Cheers, Greg
I recently acquired the rare F100 from one of those "random lot of junk" auctions on ebay.

But my F100 is slightly too fast. Almost a minute per day. I wonder if yours keeps perfectly accurate time?

Do you know if the F100 is waterproof at all? From the design it seemed like it would be water resistant, but not waterproof. The original o-ring seal was very brittle so I changed it with a generic o-ring.

It's too bad that finding a real replacement band is impossible.
Thanks very much for your comments,

I too found the F-100 in a job lot. It was a small dark blur in a photograph but I recognised the octagonal case shape - luckily for me it works! After being outbid on two previous auctions my many hours of searching random lots finally paid off. There is an o-ring, but I wouldn't trust mine as water resistant, the case back is worn at one corner with being removed many times over the years, plus I imagine the front buttons might let in water (the plastic buttons can be pushed out completely for cleaning, there are no seperate rubber seals).

I don't know about timekeeping accuracy with mine, I'll check that out and report back.
Edit>> If you download the manual for the 0052 module it has a section on quickly readjusting errors +- 30secs. This would still be a twice-daily chore though to keep it exact, I have no idea if there is any adjustment control inside the watch.

I have seen a genuine band (F-200) but it was attached to another Casio watch (and too expensive), that may be the only way of finding them. The copy bands look the part (if lesser quality). The strap for a later Casio Jogging watch is also very similar, it depends how exact you need it to be.

I haven't seen any F-100 bands, again I would look for a newer one that is reminiscent in design.
Thanks for your answers!

It turns out, my F100 keeps perfectly accurate time. I was measuring accuracy without synchronizing it to an accurate source.

I just did a complete cleaning on mine, and noticed that the buttons do slide right out just as you said. BUT, I also noticed that the plastic buttons have an o-ring on its cylinder. However, because the watch is so old, the o-ring just looks like it's part of the plastic.

Anyway, a splash of water seems to be okay.

Where did you find the manual?
I checked timekeeping accuracy over 48 hours:
F-100: perfect (good to see yours is keeping time now too)
F-200: +1 sec
I would really need to do this over a week or month to get more accurate figures, it's difficult to gauge after only 48 hours.

I wondered if there was an o-ring on the F-100 buttons but they did look just like solid plastic, thanks for clarifying.

- - -

Tissot Multialarm F1, using 4325 module and 2 x 392 batteries.

I have added some instructions as I was not able to find a manual online. This watch is still a work in progress, it requires a loudspeaker (missing from the case). As already mentioned in another post on this site the Multialarm F1 is basically a rebranded Omega Memomaster. It has 3 'alarm modes' hence the name - surprisingly (to me) it does not have a stopwatch function but this is covered by a different model.

1: shows the 5 buttons and the regular time display. Day of the week is indicated by an arrow.
2: button C toggles between date (day of the month) and seconds.
3. pressing button E once displays the timer mode. It's a countdown alarm timer and can only be set to the nearest minute. Button C adds minutes to the timer which then count down to zero, button A resets to zero. I'm also assuming PA means 'personal alarm'?
4. pressing button E twice displays the alarm mode. Press button A to select hour then C to set hour, then A again to select minutes and C to set minutes. Pressing C again toggles the alarm on/off. OF means 'alarm off'.
5. shows the alarm on, i.e. AL. When the alarm is set a star is shown on the main time display.
6. pressing button E three times displays the agenda mode. As per the alarm mode set the month then the day. I think this is a seperate alarm that flashes the arrows along the bottom of the main time display when the chosen date is reached. Whether the alarm also sounds at the date rollover I don't know (as the watch is mute it is difficult to tell Smiler ). 'A' probably means 'agenda', though you still have to remember what you were meant to remember that day! If the watch is left in any of the three modes it reverts to the time display after 10 seconds or so.

Button B is the light and button D sets the time and date. It's a nice weighty watch despite being quite slim, it now has a leather Tissot strap.

- - -

The three Tissot LCD watches I have:
All use 2 x 392 batteries.

The two watches on the right display the time, the date with one press and seconds with 2 presses.
The button on the left is the light and there is also a time and date set button in each case.
The watches use different modules.

- - -
It´s not exactly the style Casio watches I prefer, but let me ask you something about the F-100.

Why is this watch so popular for vintager collectors? Is there something special I have to know about it?

How much would be a realistic prize for a mint one? 200-300 USD???
Originally posted by Nort:
It´s not exactly the style Casio watches I prefer, but let me ask you something about the F-100.

Why is this watch so popular for vintager collectors? Is there something special I have to know about it?

How much would be a realistic prize for a mint one? 200-300 USD???

Nort, I think the F100 is known to be the very first plastic (Resin) Casio watch.

But even though it's ultra rare, I'm not sure if it is that popular, since a "good" condition F100 sold on ebay recently for only $70.

There is a hidden one on ebay right now, if you really want it I'll tell you where it is. Wink Otherwise I am SO going to snipe it for myself.

I don't know of anyone who has a mint one, cause it's so OLD. Mine has lots of scratches. If it was NOS, it would certainly be worth hundreds of dollars. BUT, even though it's worth hundreds of dollars, nobody might want it... Few people know about it, and therefore very few people are looking for it. In that case, I guess it's worthless???
Ah, I see. It was the first plastic one ^^.

Im not interested, so take it for yourself ;-).

I think for colletors it isnt worthless but is a good investment for the future, if you like and collect watches from that very early digital era.

Good luck!
Originally posted by Nort:
How much would be a realistic prize for a mint one? 200-300 USD???

I have no idea on the price of a mint one, they're really worth what someone is willing to pay. Mint condition would add a premium.

- - -

Pulsar Alarm Chronograph Y785-4019
50m water resistant, elasticated band.

Main display shows time, day of week and day of month.
Press mode button once for chronograph (with lap function), twice for alarm, three times to set time and date. Also has a light.

This appears to be the same as the Alba Blue Impulse (Wide Temp) model

- - -

This next watch has proven to be a frustration.
It's a Beltime, stainless steel case and Swiss made. I really like it, it has a cool display (the alarm bell and a 3-segmented mode circle) - unfortunately I can't get it to work properly.

Edit> I worked on this watch again, totally stripping it down and re-assembling it.
I noticed that how much the module screws are tightened determines if the display works, and also seems to determine if the buttons (apart from the light that always worked) bring up the other functions. I lost an LCD segment on the first hour digit, so forward two steps and back one!

It must be an electrical issue (screws on either face of the module either need to touch or not touch, I'm not exactly sure which), after much trial & error I managed to get all 4 buttons working - it is very sensitive to change. Between the circuit board and back plate are 9 tiny springs that need to be positioned and held in place until the module screws are tightened, many places where the electrical contact may be getting impeded.

The time displays strongly, using the function button the main display can show either seconds, day of the week (i.e. Mo, Tu, We) or day of the month (i.e. 6).

Pressing mode brings up the alarm. It flashes the bell symbol on the main display when it sounds. There is no audible sound though, in fact there does not appear to be any speaker or other alarm mechanism in the watch - a mystery! There is a red 'rubber ring' part which has me puzzled - perhaps part of the alarm? The alarm mode displays strongly.

There are also 3 chronograph modes, noted 'S', 'A' and 'L' on the 3-segment circle on the main display.
They all seem to do the same thing, a basic chronograph with lap function. Seemingly only one can be run at a time which sort of defeats the purpose of having three, again another mystery. For some reason the chronograph modes display very weakly, very difficult to discern the display.

The 'correct' button simply works as a standard set button for time and date.

I did wonder if the module and case were a correct match as the module is a bit loose (perhaps plastic shrinkage over time?)
I solved this by placing some foam between the module and case.

Edit again> Buttons no longer work, display very faint Smiler This watch must have a short somewhere, it drains a battery in a few hours or so it seems. When I have the patience I might try re-assembling it yet again but it's probably just spares now..

- - -

Omega Memomaster, using 4325 module and 2 x 392 batteries (~1979)

I replaced the metal strap on this watch as it wasn't comfortable (and not very secure).
It is identical in function to the Tissot F1 Multialarm, the module is also identical apart from the logo sticker.
The aluminium front plate is missing. It looked like a camera watch so I improvised with a piece of plastic-backed electrical tape cut (almost) to shape. Eventually I'd like to make a plate from thin aluminium so I can cut slots to allow the sound through better.

It has a countdown alarm (can be set to the nearest minute, though after 10 minutes it can only be set to the nearest 5), regular alarm and agenda function. The 'agenda' consists of setting a certain date, and when that date is reached (at 00:00) the 7 date arrows along the bottom of the display start flashing. There is no audible alarm with the agenda, for the countdown and regular alarms there is a 2-tone beep. There are also buttons for light and date. As with the Tissot there is no stopwatch (this was covered by the Speedmaster model).
- - -
My first attempt at making an aluminium front plate. Made from a piece of spare grill on the back of a PC (the part where the cables connect in). I don't have the tools to drill channels around the alarm speaker, but maybe for a later version..

- - -
Casio F200-C (1980).
This watch has the original resin strap which is stamped Casio Japan on the buckle (as opposed to the copy straps which are marked Hong Kong).
I don't know the significance of the sticker on the back cover, maybe a batch code?

There is a notch in the bottom right corner of the back cover to aid removal. Previously I thought these notches were cut by owners, but this watch tells me they came that way originally. I haven't opened it up, and don't even know if there is a battery inside yet. As the watch is nearly 30 years old, if an old battery was going to leak it will have done so already - my curiosity will get the better of me eventually I'm sure, or I will want to see it working. I have another F200 where the battery did leak, destroying the module (it was eaten away in parts) - it is now kept as spare case parts for my 'wearer' version (shown previously).

- - -
Casio F103-1 and F102-1

These are simple watches that show only time and date. They both use the 695 module and take a CR1216 battery.

The F102 has an unusual case design - as if it was designed for attaching a lanyard (perhaps for wearing around the neck after removing the band?), I'm just guessing though.
On the F103 I like the twin hemispherical "buttons" at the top (though they are not actually buttons) - they are reminiscent of the F200 design.
There were several watches that used the 695 module. They were the F101-1, F102-1, F103-1, F104-1, B-612 and the F18 series (F18, F18(KM), F18(P) and F18-1). Possibly there were others too. The F18 was made in 1988, so I'm assuming the F102 and F103 were made around the same year?

I just replaced the battery in the F-102 above and thought I'd post on how to do it (only took me 9 years to get around to it!). Easy once I figured it out, but at first it seemed almost like a disposable unopenable watch.

1. The band and back of the case are all one piece, so first remove the two strap pins - using a proper pin tool makes it far simpler.
2. The band/back and front can then be pulled apart (no glue or anything).
3. Don't try to get at the battery yet. The module must be removed, it is stuck to the front section with black double-sided tape.
4. Now the module is removed, unclip the two metal tabs so the battery can be removed (it'll just slide out).
5. Replace CR1216 battery, positive side faces up (there is also a marking on the module stating this).

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