Hi,
I'm not sure what the letters stand for; looks more like an abbreviation or an initial of something.
However i believe that the "Num" indicates that this inventory number must have been "punched" in the last century.
Earlier the Inidan armouries did not use such a convention.
Also "Num" stands for "Number" which is now widely used across India in all languages; this wasnt the case earlier.
Regards,
Bhushan
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