Plated rectangular pushers on a solid gold UG

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Apologies if this has been asked a million times, I tried to search for it with limited luck.

In the world of Universal Geneve, on a watch with a solid gold case are the pushers always plated? Always solid (no)? Some of both?

Thank you
Edited:
 
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I’ve always wondered this myself and never figured it out. But I lean towards always plated.