did i get screwed? day date questions

[aa82]

Hello All,

So here's my story. I bought a rolex day date super presidential (diamond face, bezel etc...) from a local pawn shop. The watch has a serial number dating back to 1991 (starts with X). Bracelet is presidential and stamped 18k with diamonds down the middle. So some stones had fallen out, upon replacing the stones on the bracelet, my jeweller tested the band and it turned out to be 14k. Rest of the watch did test ok for 18k. The movement in the watch is stamped 3135 how ever it does have dual quickset.
I went back to where I bought it and can't get my money back. So my question is, without verifying at Rolex (because it takes a week), would a day date from 1991 have a 3135 movement? I understand that it should come with 3155, and some 3135 were modified to add the dual quickset? So am I looking at just a fake bracelet, or you guys think the whole watch is fake? Please as much feedback TODAY would be greatly appreciated!!