Hi all,
Just a few details about P1/P38s. "Original" P38s were made from 1938 to 1945 by Walther, Mauser and Spreewerke, with some parts made by Fabrique Nationale in Belgium and Brno in Ceskosolwakia. They all had the steel frame (if you except prototypes). The last "war-time" P38s were made by the French at the Mauser factory in Oberndorf in 1945-6. The civilian variant was called HP (for Heeres Pistole - Army Pistol). The P38s were - theoretically - reserved for military use and the HPs (manufactured only by Walther) for civilians and police forces. In fact, there was a lot of mix as the Wehrmacht was constantly missing guns.
In 1956, as the new german army was looking for ordnance, Walther offered his P38, which had so well served during WWII. The Bundeswehr choose a variant with alu frame and a dull black park finish. From 1956 to about 1963, it retained the name P38. From that date, it received the official designation P1 - P38 being reserved for the civilian market. And this time again, there was some confusions, as Walther took what it had handy to complete the lots for army (and police).
So the usual surplus from the Bundeswehr (or police) will be either a pre-63 P38 or a post-63 P1 (both with alu grip and black dull park finish). But you can find some "irregular" post-63 P38 with army or police markings, some being even finished in high gloss blue, which was a luxus variant sold on the civilian market at a higher price.
As there was some experiences of slide breakages (pre-Beretta!) with the NATO ammo, the slides were reinforced in 1968 (higher walls both sides). In the middle of the 70s, the frame was also reinforced with an hexagonal pin. This pin is situated on the "step" where the locking block rides. Recoil and return movements do erode the frame on this place on the old design. P5s have the pin from the beginning on.
Bye
P.S. Don't want to be pedantic, but I see a frequent error (even in the FAL link and in Gangarossa books) about the end of the P1 in the Bundeswehr. German never replaced the P1 with the HK P7 during the 80s. It was tested, maybe some elite units took some but the P7 was never officially adopted on a large scale. The replacement for the P1 came in 1996 with the HK P8, which is a variant of the USP.