Is this normal?

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Hello dear Omegaforums community. I would like to ask you something.

The part which is upside of the crown is not plated and when i look at the crown, it always draws my attention. It looks a bit weird to me since its an Omega watch. I am wondering if is it genuine or not, if is it normal on some vintage Omega watches. Mechanism is genuine cal 625.

I add pics of the watch and that part.
 
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It was originally plated. The plating has simply worn off over the years as the watch has been wound.