For the last couple of days I've been wearing all the variants of this watch; first the Tungsten cased Diastar 515, then the stainless NCC 505 and finally today the gp NCC 505.This is what I started with:
It was pretty badly scratched and dinged front and back, but it came with the extraordinarily rare gp fishtail with every link signed. 7000 of the ref 11943/ 625.3037.2 were built between 1970 and 1978. Since mine carries the five digit reference number it would have been built pre-1973.
The watch pulled apart showing the New Conception Construction (NCC, geddit?). To the best of my knowledge this is the first waterproof watch with the back attached by screws, now a common practice. The second photo shows the rubber gasket which made up the second part of the NCC. This one is in pretty good shape with only one small tear.
The case cleaned, lightly sanded with old 1500 grit sandpaper and then polished. While the watch was apart I cleaned the chapter ring with lemon juice and sea salt. The discoloration on the dial could not be cleanded off. The hands were given a light cleaning. I polish them on a piece of bond paper.
The caseback and inside of the fishtail cleaned and lightly sanded.
Test fitted,the bracelet has been cleaned, but not yet rebrushed.
Complete, including the rebrushing of the fishtail bracelet. There is no loss of plating and no real loss of edge definition; the gp versions tend to be a bit rounded at the best of times.
Thanks for looking.