It, uh, is clearer when you don't blow it up so much....
Sorry, I forgot about the space and character(s) following. Sure looks like either "MANUFEARN II" or MANUFEARN H" to me. The letter after the F is a little ambiguous, but I can't see how the 9th character could be interpreted as a "C". But I've needed glasses since I was 3 yrs old, so IDK.
Maybe "MANUFBARN II"?
Oh, and the dimple would still be completely superfluous even if there were a timing sprocket on the right side, since the stay goes straight back and not outward. Their length had me puzzled as well, but that could be a matter of the angle/perspective of the photo. (Or, they could be extended.)