The main difference to the PP is the frame with no back strap. The approximate range of serial numbers for Walther PP's produced during the war(1939-1945) are 155501P to 3906xxP. The serial number parallel to the grip on the right hand side is 15950 I believe. This was followed in 1931 by the first of the PPKs (Polizeipistole Kriminalmodell, or Police Pistol Detective Model). Walther Model PPK pistol with 'W' behind the serial number instead of the usual 'K'. When ser#'s reached 1,000,000 for each Model,the numbers were started over again at the 100,000,plus the addition of a 'P' suffix on the PP and a 'K' suffix on the PPK.
The engineers from Walther reduced the length, width and weight. The Walther PPK Polizei Pistole Kriminal was produced since 1930. The Walther PPK (Polizei Pistole Kriminal) was produced since 1930. 380 that has an odd serial Walther PPK serial. Aside from the 'W' suffix, the pistol finish and markings are identical to 'K' suffix Mod. 32acp PP made sometime between the late 60's to the mid '70's. If the serial number has no suffix letter, #389xxx is a Manurhin-made.
