In the Table below we can find the years of production for the Zella Mehlis PP and PPK from before and during ww2.
| Mod. PP | Mod. PPK | |||||
| Year | From | To | Year | From | To | |
|---|---|---|---|---|---|---|
| 1929 | 7500xx | |||||
| 1930 | 7501xx | 7574xx | ||||
| 1931 | 7669xx | 1931 | 7700xx | 7705xx | ||
| 1932 | 7730xx | 1932 | 7749xx | 7801xx | ||
| 1933 | 8005xx | 8057xx | 1933 | 7830xx | 7982xx | |
| 1934 | 8118xx | 8120xx | 1934 | 8074xx | 8271xx | |
| 1935 | 8160xx | 8178xx | 1935 | 8290xx | 9327xx | |
| 1936 | 8893xx | 9426xx | 1936 | 9357xx | ||
| 1937 | 9674xx | 9773xx | 1937 | 9558xx | 9886xx | |
| 1938 | 9833xx | 100xxxx/1455xxP | 1938 | 1276xxK | 1745xxK | |
| 1939 | 1555xxP | 1563xxP | 1939 | 1789xxK | 2462xxK | |
| 1940 | 1576xxP | 2032xxP | 1940 | 262xxxK | 3072xxK | |
| 1941 | 2153xxP | 2202xxP | 1941 | 311xxxK | 3580xxK | |
| 1942 | 2250xxP | 2826xxP | 1942 | 3585xxK | 3907xxK | |
| 1943 | 2879xxP | 1943 | 4004xxK | 4081xxK | ||
| 1944 | 2889xxP | 3747xxP | 1944 | 4096xxK | 4264xxK | |
| 1945 | 3802xxP | 3906xxP | 1945 | 4274xxK | 4309xxK |
For post war Ulm Walther PP and PPk’s the serial number is usually stamped on the slide of the gun.