15mil serial on movement dates to a 1956 manufacture date. Patina is quite nice and sub dial is nice to look at. Early Seamaster model before the hippocampus logo in the middle. You can see the markings of 'Seamaster' and 'Waterproof' are rubbed away somewhat due to wear. The Cal 410 is a workhorse movement for Omega, though it is on the small side, so I'm guessing the case is about 34-35mm wide. Unsigned crown, though that should not detract too much, and if anything, suggests the watch has been looked at in one point in the past by a watchmaker or enthusiast.
Pricewise, anything from $150-$225 seems fair. eBay will tend to be $250-350+.
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