Old Piaget quartz

My unlcle has this old watch.  It has no crown just this button on the back.  He's a not all there so I'd like to set it. Do you guys know?

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Looks like the crown snapped off the back.

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There was just a post on another Piaget with similar winding yesterday

https://www.watchcrunch.com/Thewatchguy/posts/the-beauty-itself-15563

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Thanks a bunch guys... it looked like something should have been rotating on the back.  Will take to a dealer tomorrow