Sadly, if you want to maximize the amount it sells for, it should be tarted up with a repainted dial and a healthy polishing to appeal to the "OOoooOOOooo, shiny!" buyers. The problem is you might not get your money back for the cost of the service / work. This isn't a particularly rare or sought after watch, and in it's current condition wouldn't appeal to a collector because it's dial has already been repainted once so get it done over again. It would make a nice dress watch if spiffed up.
It's a British made case, by Baume & Co, who were Longines agent for the UK back then. You can see their mark to the left of the FAB SUISSE. It's powered by a caliber 23ZS which Longines created in 1948. The serial number for this particular 23ZS dates it to 1953-ish.
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