welcome01 to the forums from the Wiregrass! 1952-53. It is a .38-44 Heavy Duty. I'll let someone who knows the APD guns give you a value. It seems to be in pretty nice shape for an LEO gun.
I suggest to send a private message to Larry (Ringo1597) who started this thread. Larry is a retired APD officer who is THE authority on APD guns and probably owns half the guns ever issued by the department.