France even those in the strong room upstairs are not Swiss ETA they are Chinese ETA copies.The Swatch organisation own the ETA movement and stopped selling them to anyone else years ago,there were some old ones about that were being put into reps but the first thing you need is a service which costs hundreds if you can find someone to work on a rep.despite what people say about their brilliant fakes you can still tell the difference for a variety of reasons,the biggest tell on a Rolex Sub or DSSD is the white bezel markers as Rolex use platinum,the next is the steel used to make them is a lower grade 316 Rolex use something like 914 which only they use so it gives the watches that distinct look.I buy and sell watches both genuine and good copies,I have a friendly watchmaker who,if I get a good enough copy I can take to and swap out some parts or have it modded as we say to be more genuine like but you can always tell.Personally I don't care as even some of the reps are things of beauty and can be admired for the craftsmanship.it is quite funny though when you see blokes in Prinark t shirts,£6 Ray Bins who tell you the £38k Rolex ,Audemars Piquet,Piaget etc is the rea deal!Anyone asks about my watch I will tell them as I have both gens and reps,some of the reps get worn more.
Advice,if you like it,you are willing to pay a price that you are comfortable with,you don't expect it to last a lifetime ,buy it.That goes for bags,glasses etc as well