Huh, neat. I think probably this one is technically correct for this gun (vintage 1918), although the two don't look very different. (I assume the "Mk III" and "Mk IV" are the marks of the oiler itself, not the rifle it goes to, since there was never an SMLE Mk IV—the next version after the SMLE No. 1 Mk III* was Rifle No. 4. British designations are kind of a hodgepodge, but on the other hand, they avoided having an M1 of everything in their inventory that way. :)

--G.
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