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I needed a watch while travelling in Vietnam and bought an F91W from a market stall for a few bucks. It's such a cheap watch I didn't even consider that people sold fakes.

A few weeks later I noticed it was slowly losing time and had some other issues, clearly a fake or reject watch. So that's how, I guess.

If it costs 2-3USD to make and you can sell a million worldwide... :)

nobody bothers to buy it, sellers just get a better margin.