Omega states the Seamaster line-up started in 1948, but I don't recall seeing the word Seamaster on the dial for the first few years. I think (and I'll probably be corrected) it was the early 50's that Omega started putting Seamaster on dials, which is about the same time the crowns and crystals started getting the Ω logo - give or take a few years.
So noted.
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