General profile appears to be for a relatively long semi-auto pistol, perhaps a .22 target pistol (Colt Woodsman or others of that period). Finding out what the holster fits would probably assist in establishing a market value (greater demand for some than for others). The "483" stamp is probably Alamo's catalog reference, so if anyone has Alamo catalogs on hand that should establish what handgun the holster was intended for.
Perhaps you remember what handgun(s) your dad had back then? If the actual handgun remains in the family that holster would make a wonderful addition.
I've seen a number of Alamo products over the years, so the company was reasonably well known and successful. Finding a collector who specializes in that brand might maximize the actual return, as well as preserve the holster for posterity's sake.
Otherwise it is just another old holster, worth only what someone is willing to risk without knowing exactly what he is buying.
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