The dial is almost certainly a redial. The lettering is way too crude to have come from Omega like that. Also, the dial register marks are far off from the corresponding 5-minute markings.
Here's an example of a similar dial that is all original:
The thing about this particular reference is that there are very few in existence with their original dials. There was just something wrong with the finishes used on them. Here is one of the few I can find:
Read all about this one (owned by a forum member) here:
https://omegaforums.net/threads/omega-14311-a-chronometre-review.4566/
Here is an ad from the mid-50's showing your watch. I believe that Omega erred here, as the ad is for a "Chronometre", not a Globemaster, which would have had a star on the dial, similar to the Constellation.
Your watch has the hand-stamped "OXG" near the balance, which denotes a US market movement.
Very nice watch, despite the redial. A good watchmaker who knows his Omegas, should be able to find you a proper seconds hand to replace that one.
gatorcpa
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