Hi
We really need to see the outer caseback & movement to be sure which version of the sm300 this actually is....I reckon the dial is good. The earliest 'military' relating sm300 I have seen was a 165.014 (but even that was purchased privately)....and as it appears to have the correct end pieces & semi-expandable bct then I'd imagine this was perhaps possibly bought by a Serviceman , but not issued.
You can request an 'Extract of Archives' direct from Omega based on Model & Movement Nos for £90 GBP.
Best - Neil
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