I don't see any reason why the dial cannot be original. The gold-capped versions of this reference to appear to be very uncommon, but gold "mirror" indices, like those on the dial in question, would match perfectly. As for the style, there are similar ones in catalogues from the '50s, and here is a ref. 4914 that was sold on this forum:
https://omegaforums.net/threads/longines-jumbo-with-hobnail-dial-price-reduced-to-950€-or-1-040.161886/
It features applied indices, and a textured dial, but the basic style is quite similar.