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Looks like one of the last ones from 1970 or 1971......
I would talk to Mark at German Motors in Lakewood, CO probably only 4 or 5 miles from Golden. Very experienced and knowledgeable about the older cars. He just tuned my 280SL and replaced all of the sub frame and motor mounts. Did a great job. I bought my first Mercedes from the shop's prior owner in 1976.