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Definitely Buick. They had a thinner version of the turn signal lever but I don't remember what year they switched. I think the one in your picture is '70-'77 Ish? Not 100% on the years though.
I'm going to guess 70-72 as it looks like one that I had on a column that matched the 70-72 cutlass column. Scott may be right and it may have also been used for more years than that though. John