In 1957, Omega introduced what would later be more known as the Moonwatch. The Speedmaster Professional gained the nickname after being made famous as the first watch on the moon, as worn by Buzz Aldrin on July 20, 1969. Today, the "Speedy" is one of the most iconic and recognizable watches around, right up there with the Rolex Submariner and the Cartier Tank.
A certainly not obscure, but definitely less well-known cousin in the great Speedmaster family is the Flightmaster. Marketed towards pilots, it was a behemoth of a watch, some variants being 16mm thick (go get a ruler!) and the gold variant weighing in at around 250 grams - effectively making it one of the heaviest watches Omega ever produced. The issue with buying vintage in these days, where watch cases of the larger variety (think Luminor) reign supreme, is that you'll often end up with a watch feeling diminutive on your wrist. I'll bet you that this won't be an issue with the Flightmaster, a solid watch that surely will cause a lot of attention - you don't even need to be John Travolta.
Photograph courtesy of Chronomaddox.com.