That's a good start, noting that the dial looked too clean. I'm always suspicious of a very clean dial, but... a big BUT... you can miss the boat on a pristine example if you're not prepared to recognize it for what it is. Sometimes too clean is just right.
The color of the lume jumped out at me as a re-lume, and the font didn't look right. Some of the hash marks on the minute register looked unusually thick... over-inked, like the too-bulbous dots. Compare it with this Kosher-looking example of a ref 20503 with cal 267 and look closely at all the details - you'll see what I mean:
http://omegaforums.net/threads/need-help-authenticating-1950s-military-watch.9890/Click to expand...