[Thor]

Some will have more than one date, like a 1916 1920 stamping which according to Still Are Imperial Lugers (WWI) with their original chamber date, like 1916, in the above example, then restamped with the 1920 Reichswehr Property stamp. Also Mauser dropped the "19" from their 41 and 42 byf and some "42 toggle manufacture codes" production guns, with the 41 and 42 being the chamber dates. 41/42 and 41/byf and 42/byf were standard issue date/code combinations. Many commercial Lugers do NOT have the chamber date stamp, like George mentioned. The 1934 and 1935 chamber dating was omitted from Mauser Military production but replaced by K (1934) and G (1935) chamber markings. They also used their secret "S/42" production code representing Mauser. I have no idea who this fooled if anyone.