My grandfather recently gave my brother a 1945 official police 38 special revolver with a 4" barrel. For christmas I hope to get him an official belt holster to match the vintage of the gun. Any knowledge on where I can purchase one would be much appreciated.
Are you looking for a period-correct style of holster or a genuine holster from that period? If a holster from that period, look for a JM Bucheimer, Bucheimer-Clark or Jay-Pee. I'm sure they're others but those names come to mind.