As someone who is into watches,, biggest obvious thing is if they tick they are a quartz, not many swiss watches have a quartz movement, they have either a manual wind or automatic movement, which creates the sweeping seconds. You can also find replicas with auto movements and they are usually of a higher price, search the internet hard enough and you can find replica sites that can be as respectable as you could hope an illegal replica peddler could be lol. The biggest tell on these is coloured screws, no regulator on the balance wheel (not easy if its a solid backed watch) and if you listen