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Girard Perregaux

usually...

 

...it means than the nickel plating on the screw slots has not been removed.  As I understand it, only clean polished steel will blue under heat.  Since watch screws come with nickel plating, they won't blue unless the plating is polished off.  It is common (and easy) to polish the screw heads flat to remove the nickel, but this leaves the slots with their plating that stays silvery.

The two solutions are to use unplated screws or to polish out the slots.  I learned that Dirk Dornblueth actually does this as part of his screw finishing (beveled heads, etc) and his screws are a uniform blue.  Why he (and others) don't use unplated screws to start with is a mystery to me.

-Tom

 

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