I need to rephrase that. Although it is true that the singer 201 made it's debut in 1932... the potted motor model 15 (unsure if this would be a 15-90 or 15-91) had been out since at least 1930. What's really interesting... is that while the 1930 15-91 had the same reverse/forward lever as the later 201's... the regular old 15 with an external electric motor and belt drive continued to have a lever much like the one in the OP's photo up until at least 1937. I'm still at a loss to discover when exactly the belt driven 15's were given the 91 type lever.