I think what you have is a gun manufactured by Ceska Zbrolovka Model 38 {. CZ 38 for short }. The alpha letter and number would be the inspector marks, and 39 would be the year made ( 1939 ), When the Germans took a vacation in the Czech country side they decided to incorporate the factories output into their own system as the Pistolen 39. You may or my not have German acceptance markings , if you do, it will add abut a 10 percent premium. I will let someone else guess-a-mate the value. The pistol was not well received because of the difficultly in firing it, the action ( Trigger Action ) was very stiff, after firing the action would chamber a round, but the hammer would follow the slide down, every shot required cocking the hammer by use of the trigger. at least that is what I think you have
Could be wrong, been wrong before.