In 1957 Omega introduced the Omega Ranchero. A caliber 267 in a simple 30 mm case, but with borad arrow hands. After just 2 years of production - it was put down again.
Later in 1984 it was tryed again: with same failiur!
Buzz Aldrin was the first man on the moon - with an Omega watch. Amstrong left his in the lunar moduel. Buzz's ref is not identified - but most likely a Speedmaster ref 145.012.67 SP fitted with the famous caliber 321.
His watch was stolen and therefore it's not clear what ref. he actually wore on the moon.
Somehow the Omega collectors started to give their famous watches nicknames. The most famous Omega collector and knowledge-base Chuck Maddox - named most of them - R.I.P.
BANANA - Seamaster 200 with yellow dial
ALBATROS - 1976 Olympic model with analogue and digital dials
Omega Seamaster PloProf Designed by Jacques Cousteau. Omega Seamaster PloProf, short for Plongeuer Professionnel, or Professional Diver in French. The cases were routinely hydrostatically tested to 60ATM and shock tested (500g weight dropped onto a running watch from 25cm). In one test the watch was taken down to 1370m using hydrostatic pressure and it was reported that it only stopped at that 'depth' as the crystal had deformed to the extent that it was resting on the seconds hand, so stopping the watch from running. Interestingly, this failure can be partially attributed to the design of the case sealing, which whilst superior for the advertised 600m rating, would not be correctly designed if going beyond 1370m.
And by the way - he also designed and speced the Big Blue. Seamaster 200 diver able to tract two dives. The one and only mechanical watch with that feature.