1974 s/s/s Silver Ike Dollar Proof??

Hey guys, my eyes are playing tricks on me again. This mintmark doesnt quite match any of the photos ive found of MM1 & MM2a b or c. I had a hard time imaging it for you guys but i thought it worth a shot. Anyway here it is-I believe there were 4 types of MM for 1974... Does anybody recognize the MM style of this one?

Much appreciation

 

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I check IDDD site, and nothing for this year, so I'm not sure ...