I haven't been around forever but have never seen this lume on a dial before but it doesn't strike me as terribly incorrect. Wondering if perhaps it was applied after the fact and fitted with new hands (original would have had onyx insert). Either way clean job and interesting to see. Anyone think this may be factory-original? https://www.ebay.com/itm/353863582160?Purchases made through these links may earn this site a commission from the eBay Partner Network FWIW comes with an omega slide clasp BOR so if you think all original price may be right all in for about 1k with offers accepted...
To me, your notion that the lume and hands were added makes sense. Still quite a nice watch, but a little pricey IMHO.