Here is a link to a very similar 135.004-63 RM that
@abrod520 sold 3 years ago. Also caliber 286, 20474xxx movement number, same handset, with extract.
https://omegaforums.net/threads/omega-railmaster-135-004-63-early-1964-production.51299/
I think the OP example is fairly legit. Most 63’s have tritium lume even thought TT (or sometimes a single T) are not always present. The dial has the proper layout and recessed lume wells. I’d be concerned about the hands and dial being relumed as the lume is very uniform in color and bright. Also the lack of a pic of the mag cover needs to be addressed.
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