A long-time customer brought this 1981-vintage Rolex GMT Master in to be serviced, have the bracelet repinned, repair the scratched crystal and a general exterior clean-up. As in gunmaking (or any other profession) there are those that probably should not be doing the work that they do, and this particular watch is a good example of why one should be very careful about choosing who they allow "under the hood".
Let's start with the case. Rolex cases (pre-2003) have their lugs drilled completely through, theoretically making removal of the bracelet or strap pretty much foolproof. Well, nothing is foolproof for a sufficiently talented fool. The majority of external damage to the case was due to failed attempts to remove and replace the springbars. There was also some minor rust pitting (stainless steels aren't rust proof, but rust resistant) but nothing that would compromise sealing of the case.
The case, before:
The case, after (no buffing wheels are employed during the process):
The polycarbonate crystal had a number of deep scratches. They were block-sanded out prior to hand polishing.
Now, on to the dial and hands, which were mercilessly scratched. The dial scratches were no doubt caused by careless removal and replacement of the hands. The scratches on the hour and minute hands appear to have been caused by attempting to scrape them clean with an X-acto blade or something similar. Beyond properly cleaning the dial, not much can be readily done about it, but the hands can be saved.
The dial and hands, after:
Now, on to the movement.
The autowinding rotor was rubbing on the balance cock AND the inside of the caseback. How can this be, you wonder? Because the rotor axle was not properly secured, allowing it to "float" in and out and wobble while doing so.
The retaining ring for the rotor is itself retained by the rotor pinion. This pinion has a pocket machined into one end that envelops the retaining ring, preventing the ring from backing out of its slot in the rotor axle.
The problem here is that the rotor pinion was installed upside down, thus negating its ability to retain the ring that retains the rotor.
As with their counterparts in the gun world, the uncaring are duty-bound to wreck every screw slot that they encounter, and sometimes even the area around the screw head.
Then the movement was flipped back over to disassemble the balance and main train.
Everything cleaned, subassemblies assembled and lubed and ready for final assembly and lube.
After reassembling/lubing the movement, the dial and hands are reinstalled (making certain that the date changes at midnight) and the movement is recased (the crystal and its retaining ring having already being reinstalled). At this point, new stem and crown seals are installed, as well as a new caseback seal. Prior to final tightening of the caseback, the watch is tested on the timegrapher. After final adjustment, the caseback is sealed up and the watch is wet pressure tested to 3 atmospheres (a.k.a. 3 BAR or 30 meters). After the wet test, the timing is again checked and then the GMT bezel is assembled. This is done so that there is no chance of water being trapped inside the bezel.
The lower endpiece had a couple of dents in it which I remedied at this time. I made a backup block (shaped to fit the inside of the endpiece) and used that to support it while I tapped the dent out. Then the brushed finish was reapplied.
The bracelet was reassembled with new pins. The worn link screws (for the removable links) were shop-made from 316 stainless.
I reinstalled the bracelet (after taping the lugs) and the job is done. Even though it still sports the damaged dial and bezel insert, it is now much more presentable. Most importantly though, it functions correctly.