Mauser question need answer asap please.

[GUTS]

The serial number range for the 1940, 42 code is 1660 to 5499gg. The rifles did have flat butt plates untill later in 1940 when they changed to the cupped butt plate. The waffenampts on the "42" code rifles changed in 1940 from waffenampt "63" to waffenampt "655". Some no letter range rifles can be found with "63" proofs. A mixture of "63" and "655" proofs can be found on rifles in the "a" range but as soon as the "63" proofed parts were used up only the "655" waffenampts appear.