Unit Markings on this Enfield?

[Baal]

My mismatched poor old 1930 Enfield. Would they be unit markings? If so, ideas as to unit?

Oh, and any ideas what the M means?

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[Peter Laidler]

I can't see them being anything but stage inspection markings Baal. Not even a steel batch mark because the body was flame cut from steel plate initially and then shaped externally on a pantograph miller. (Probably internally too but more complicated.....) But not subject to steel batch certification. Incidentally, that little hole in the rear corner of the frame was one of the what were called 'datum hold' locators.

Not unit markings because they'd be covered by the grips