Please consider donating to help offset our high running costs.
https://www.omegaenthusiastltd.com/product-page/1940-omega-sub-second-2 also has a number on the lug.
And this one as well https://www.watchuseek.com/threads/omega-officer.3198098/post-29335650
Another: https://www.watchuseek.com/threads/1941-omega-officer-watch-wwii-swedish-army-order.4950625/