Hi and welcome. Your watch case was made by the American case maker, Ross, under licence from Omega. This was not uncommon (with local production also occurring in France, the UK and Sth America) to get around import restrictions and tariffs on gold or whole watches. (see more info here:
https://omegaforums.net/threads/ross-14kt-cases.18171/)
It is "gold filled" which is better than gold plated, but not as good as gold capped, or solid gold. See here for an excellent article:
http://users.tpg.com.au/mondodec//GoldCap.pdf
The serial number on the movement (14xxxxxx) dates it to 1954.
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