I like your watch, especially the yellowed tritium, and welcome Paul!
Not sure if it helps, but I have a Geneve ST131.019 which has a similar kind of dial, with crosshairs and a red Omega symbol, but it has a cal 601 (no date) instead. These are pretty robust manual-wind movements so yours will be fine I'm sure.
There's also a
page from a catalog at old-omegas.com which shows a Seamaster 600 with a red Omega symbol and crosshairs, similar to yours, but with an additional inner ring of markers and no date. Perhaps your watch and that watch were part of the many dial variations produced in the 60's? Hope this helps.
edit: hey I found a SM600 that looks like yours but with red crosshairs,
here.
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