Nickel Allergy

Do somebody know something about the quantity of nickel used in the metal of the watches of the 70`s and 80`s, please? I ask, cause my girlfriend suffers on a ncikel allergy. But she likes my lcd-watches from that time and would like to wear some of those. 

 

The thing is, she weared one of my watches and nothing happened. But she wants to be sure, that in the future everything is ok. 

 

In germany there is a limit for the emission of nickel based products to the skin. They say 5 mikogramm/cm*cm/week is ok. 

 

Can someone tell me something about that, maybe in relation to the numeric limit i described, please.

 

Thank you very much

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