Get yourself and a good camera quickly to a watchmaker.
Ask them to remove the caseback.
Take a photo of every step with a time/day/date stamp on your photos or a time/day/date clock in the background.
Take good clear photographs of the movement and the inside of the caseback to ensure that it is not a Rolex.
Thank your watchmaker for their help and pay them.
Approach the seller for a return, provide photos if needed.
ONLY COMMUNICATE VIA EBAY.
If they jack up, raise a case with eBay.
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