If you like it and will wear it, I think you got a good deal regardless of the price.
Mikrolisk records the wordmark "Superatic" as a belonging to Georges Benguerel Fils & Co (Montres Benguerel Fils) of La Chaux-de-Fonds, Switzerland. The mark was registered in 1932, although I'd guess your watch dates to the late-1940s to mid-1950s based on the style.
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