MC was one of the Minolta manual focus mounts although in this case its difficult to tell as a lot of lenses around the 70's to 80's had MC on them designate multicoating which was fairly new at the time.
I don't think that it is a Minolta MC mount as it looks nothing like the slightly different MD mount on a Minolta 50mm lens that I have.
MC indeed stands for multi-coating / multi-coated and third party lens manufacturers didn't usually put the mount type on the name ring. If they did it at all, it would be on the side of the mount, or on the bottom.
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