Nice write up and amusing.....the link is a diver's extension. They come in two sizes. The kits usually provide the long extension (Hence the "L" stamp).
Your SD will have a shorter version of this and the kit allows for changing. Skin/Snorkel divers usually leave the original on and Scuba divers wearing wet suits opt for the longer so the watch can be worn over the sleeve of the suit..............I think.
I prefer the NDTrading case.
If you look at the area where the "ears" of the endlink rest, you can see the edging/step of the NDT case in the picture here The watch at the bottom with the smooth fold-over is the NDT:
As well as at the base of the crown/tube:
Now the MBW has only a smooth transition from where the caseback covers to the edging of the case shown here:
here are a few more of the NDT. I would say it is like a Channel that that surrounds the caseback:
I hope this helps ....
Well, I am glad our talk wasn't a waste of time.........I swear, I'll hunt you down and take a hammer to what ever abomination you build with that GMT movement............Seriously, I will......
I did this mod by using a very fine grit paper, gloves(no prints on the dial) and I gently rotated the rim of the dial and test fit until it worked........use care and be willing to spend a lot of time.
Someone here has the 1680 I modded with the Gen dial.....I believe it is Chieftang
The 501B endlinks are on my 1680 now. The 5513 has a Gen 93150 with 580's......old pic, sorry. The 501B's came from my Gen 14060M........watch head sold, Bracelet sold without endlinks at buyer's request.
Now as for where I got the bracelet so cheap......lots-O-patience and searching
So here is the ridiculous cost of my project:
Dial and hands Gen and NOS: $550.00
Case from NDT: $950.00
Gen 1560 Movement donated from 1963 Rolex Oyster: $800.00
Gen NOS bezel and insert including crystal retention ring: $250.00
Gen T-19 Crystal: $40.00
Gen crown/tube $60.00
Gen Bracelet w/580 end pieces: $200.00
Gen spring bars: $10.00
Gen caseback gasket: $2.00
Movement serviced assembled and cased by my watchmaker: $free
Total: $2862.00
I'd buy another NDT case if I had the ca$h. My watckmaker was quite impressed with the overall quality and finish as well as the ease of pullin my All Gen 5513 together.
Not to mention that dealing with Natalie was a great experience.
Peace!
Good work Marty.
A little cleaning up of the inside of the CG's and you are set. Nice Gen clasp as well. The Lugs look good and could probably use a little more polishing to clean up the bevel.
Nothing like the satisfaction of doing it yourself.
Wear them well.
Kurt.
If you don't countersink, the tube/crown will have a gap at the case. A small gap is common, but not countersinking will leave a very pronounced gap.
Gasket or gasket sealant if properly applied will serve yuor needs. it's the aesthetics you need to choose.