Two types of P38 holsters were produced during world war 2; hardshell and softshell. You can clearly see the difference from the picture below. Hardshell holsters were produced from 1939 up to 1943. After 1943, mainly softshell holsters were manufactured. All wartime P.38 holsters have the same hanging system, consisting of two belt loops. The closure strap can be down or upwards. All P.38 holster are marked with P.38 on the back and most of them are stamped with the secret code of the manufacturer.
Below is a list of all P38 holster manufacturers. This list is probably not complete...please email me if you have any additional information.