Excellent call Mark. But Mellings doesn't show a MC part # cam with only 3 numbers, unless it starts with an 8.
Lot of MC camshafts, but the vast majority of them are 4 digit numbers. But I agree, it could very well be a Mellings.
If it is a Mellings, I would think the cam would be stamped CMC(Camshaft Machine Company) on it somehwere as well. It is also possible its a Muskegon Camshaft blank.
Just not enough info to ID it for sure.