I just got a 1942 Maltby No.4 Mk1 and noticed a strange stamp on the receiver socket. I got all of the various stampings defined but this one, I've had 20 some No.4 rifles over the years and never seen this marking before just below the year of production stamp there is:

29/K
52

I have ran through all of the online researching sites and went through a few books but nothing. I am aware that there will always be various stamps with various meanings some of which will never be defined and I am hoping this is not one of them.

The socket is stamped just as all No.4's are with the serial atop and the date just below, no other surprises
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