The grand bazaar in Istanbul is full of fakes of varying quality.. the ones they sell for $40-$60 are very obvious fakes with poor movement, poor weight, shoddy tolerances, etc..
the ones they sell for $200-$300.. would be a challenge for anyone other than a jeweler to identify as a fake.. they use quality movements.. and make the things on CNC machines, etc.. out of quality components and parts..
I like to think I can spot a fake easily, have quite a bit of knowledge about most of the "common" high end brands and their primary lines, etc.. but.. I stared at a "folex" for 10 minutes at the Grand Bazaar last year.. knew it was an absolute fake.. but couldnt identify a single thing "wrong" with it (they even had the damn near impossible to copy rolex movement down perfectly)..
Most of the junk you see in China looks close enough at a distance.. but once you actually pick the watch up and look at it.. it becomes very clear that its a copy...