Hello,
the S/42 stamp was not applied by Mauser. Most probably by the armorer of the unit.
Some prewar RG34 are marked with "G" or "K" for rifle/carbine and the serial# of the gun.
Some RG34 are marked with a unit stamp.
This is the only one I've seen so far with such a detailed allocation to a certain gun.
attached photo shows a RG34 with Navy acceptance and unit marking.
Tom
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