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It's fake.
Pretty darn convincing fake, but yes, a fake. Also, missing a case screw for some reason (next to the balance)!
It's a good enough fake that it could be sold for 2k easily. Most people would need to spend half an hour looking back and forth to start seeing discrepancies, and what % of the population would?
I'm glad you came here OP! Watches can be had for deals, but almost never that good of a deal.

Clearer pictures would show there is no hairspring attached to the stud and all the jewels on top are empty.
As I've been saying for years now, the empty jewels are a dead giveaway even if you have no idea what the real movement looks like.
BTW the serial number on the movement is for a DeVille Prestige with a Cal. 2500...so very far from this.