I'm sorry, but going ahead and buying any watch you suspect could be a fake does NOT deserve our sympathy!
WatchTalkForums is now and always has been, less than tolerant towards counterfeit watches.
I dare you to pop the back off of that puppy. Patek Philippe hasn't made men's watch modules for a number of years now, so if that watch doesn't have a Swiss, Patek Philippe signed quartz movement powering it, it means that if you paid more than five dollars for it, you got fleeced BIG TIME.
Ok, I'll soften things up a bit. IF the movement inside does not exactly match one of the two movements shown on this page , then you have a fake Patek. That said, Patek makes top quality watches that sell for some significant $$. Everything about them is top quality including the case, the dial & the movement. That watch is missing on the first two and has all the earmarks of an Asian fake.
We probably shouldn't pound this guy too hard, at least he had the sense to ask . . .
There ARE some amazing scores out there, sometimes you get lucky. I got a Vostok Submarine Commander from a thrift store for a quarter, seller said it didn't run, needs a battery. Clever Russki's, you wind the stem and it works a little dynamo which charges the battery ;-). I was selling Vostok watches for a while (new), supply dried up because it seems Vostok Europe got into a fight with Vostok Russia over copyright, so no more Russian Vostoks right now. Mine is older, it was made when it was still the USSR. They aren't/weren't expensive watches, under $100 new, but for 25 cents, hey not a bad deal.
I had a nice spare-time gig for a while fixing watches for a hospice resale/thrift shop. Their instructions were if it needs a battery, do it, anything else is yours. They didn't want ANY mechanical watches because invariably someone would buy them and the next day bring them back saying "it stopped".
Scores: 1871 Illinois pocket watch, series 1. Omega Speedmaster Deville, 1965 vintage, rose gold movement, runs. Bulova 214 Accutron (not a Spaceview), battery not easily available, it had a truly nasty NATO strap glued on with hot glue, which I cut off almost instantly when I got it home. Runs perfecly. Couple of 40s and 50s vintage Bulova watches ("Senator" series and similar), couple of Hamilton watches. A fake Rolex which I opened (had to buy the Rolex style case wrenches off eBay) to see what was in it, and it had a Seiko 8250 movement in it - obviously a fake, but not utterly ghastly. Strange looking "high style" woman's watch (quartz), saw two offered on eBay for $300 or so each. Had to put a $9 movement into it, Dear Bride said it was ugly and she didn't want to wear it.
Also got a 1930s vintage car dashboard clock/watch. Looks like a BIG pocket watch, they went onto the dashboards of prewar expensive European cars. I forget the name, but the current owner of the name knew ZERO about it.
Someone also donated a bare reasonably current Breitling movement and dial - no case - real thing, correct ETA movement and all. Lume falling off the hands, but the dial is good and the movement works.
Gig ended when they accused me of getting into a fight in the parking lot. That was complete news to me, I was 69 years old at the time, and have never been in a fistfight in my life (before or since). Might have been my evil twin brother, but I don't know for sure. Haven't seen him either, before or since, so I guess some things will remain a mystery.