Cal. 551 in 14381 case. Worn with Hirsch strap, correct buckle, and a 1980s Norwegian Army jumper - oiled wool and the best such garment ever made, plus it's not obviously military so you can walk down the street in it without feeling like a Walt! Also a rogue cat hair that found its way onto my wrist....
Hamilton GG-W-113, August, 1987, cal. 649 (hacking), original,strap. And, an example of original packaging...
What a beauty! Kicking myself for not buying your Waltham Diver when you sold it... so just in case, DIBS on this one!