Great example of the forum at work. Bought off eBay, then fitted with NOS cursor ring, outer bezel, and crystal, all from forum folks. Then serviced by a forum member. Ended up being a piece I truly feel privileged to have. I remember the call where Jonathan was talking me through securing the inner bezel ring while making sure the cursor would still be able to rotate. The man was a genius!
Interesting thing I never knew until I got it. These came with a flat-top acrylic crystal, not hardlex. I think it's the only 6138 that used plastic.
Also, a neat trick. It uses a wire for the outer bezel ring, which I was missing originally. A silk wound guitar string worked great and created this really neat sound as the ring rotated! Alas, correctness won the day and the guitar string was ultimately ousted...but cool nonetheless.