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they were also used on early SMLE Mk1 rifles. Nice mag. I've seen them occasionally in pre-WW1 SMLE MkIII's also, but not sure if they left the facotry that way.
Looks like a No3 mag for the SMLE. It should be stamped with the number near the bottom of the spline on the rear of the mag. These mags were modified from the No1 &2 mag to use the MkVII ctg and had a spring added to the rear.