what parts makes a genuine rolex become a fake.

[EDDVM]

every one prefers a 100% original, un-refinished rolex, with box and papers ect but... first I was seeing alot of genuine watches with nice replica band's.... does this make the watch fake... got my thinking about the tulex...every one blasted him about selling a fake watch. flaged him on e-bay but it was a original watch with a refinished dial so FAKE!!. FYI I have owned a genuine Tutor AND rolex on the face. un-modified original. I owned it, it was made about 1954 and servecied at a AD in oregon.

Ok when buying a used rolex ... if lets say the case is genuine and the movement is a ETA..is it a fake. which I have seen real examples of this. mostly older conversions. not eta replica's saying the oh yeah the case is ligit but vintage 1500 and 16000 case's with a old eta as the movment. or the case is a replacement and the movment is correct like I saw with a 18k presedent case.

Or what about rolex cases with the wrong rolex movments... They are not factory so they must be fake.

What can be considerd a rolex and what is considerd a fake.?
like my Presedent has the original case and movement. A aftermarket dial, and the crystal is converted from a plastic to saphire. And it has a aftermarket diamond bezel. so it my $10,000 prez. watch a fake?.

What amount of aftermarket parts are allowed before the watch is no longer a rolex......