I don't see an issue with purchasing a watch on eBay.
One recommendation is to simply stick to purchasing from sellers with a large amount of positive seller feedback. There are many reputable dealers on eBay with outstanding feedback.
Nevertheless, eBay has a 30 day period where, if an item arrives not as described, you can return it. Even if the seller "does not accept returns" you can always return whatever you receive.
You can always purchase a watch on eBay and have it checked locally by an AD or trusted watch dealer.
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