Can someone please tell me what the N22 means?

[Bigedac]

I have, what appears to be, an original MK 4 sniper. All of the information I have been able to find shows it manf. by BSA and "sniperized" by H&H. The only "fly" in the ointment is the S-51. On my rifle there is a N22 stamped where the S-51 should be. There is a broad arrow to the rear of this mark. There is also no scope number to be found on the stock. This rifle is near mint and does not have an original scope. The cheek piece is held on with brass slot head screws. Can someone please tell me what the N22 means? Serial number is C354XX built in 1944.
Biged

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