Without seeing the movement serial number, I can't say for sure, but it is possible that this watch was readied for sale after 1951. That was the year that Omega (and other Swiss brands) were required to submit movements for testing in order to use the words "Officially Certified" on the dial.
You'll see some familiar names in this thread.
http://omega.watchprosite.com/?show=forumpostf&fi=677&pi=5624973&ti=832198&s=0
I think this where I invited Achim over to OF.
gatorcpa
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