For the past few years, I have had timing issues with my assembled-from-gen-parts TOG, the cause of which I have been unable to locate. Everything appeared copacetic.
So, recently, out of frustration, I decided to throw caution to the wind & let Rolex take a shot at it, even though, in spite of the numerous reports of gen owners having their gen watch rejected by an RSC because it contains an aftermarket crystal or other non-critical part, I fully expected them to detect the non-stock formation of parts & reject the watch. Almost shockingly, not only did they accept the watch for repair, but the watchmaker that performed the work on the watch phoned to let me know that repairs had been successfully completed & made a point of complimenting me on the watch's overall condition. Because this is a major RSC, I think this both compliments the watch & demonstrates that even Rolex themselves cannot always identify a vintage franken from its oem counterpart.