(such as yours) being smooth-laquered, with the larger simply brushed.
These are in any case beautiful and historic watches.
I don't know the production figures (although an email to Omega would probably
yield them), but I have noticed that there are variations, pink gold, yellow (as are mine), as well as different
dials. I believe the set below was originally sold in the Asian market.
Here is a picture of mine, please note that the dial in the watch at right is a replacement:
(click for more pictures and a brief article)