I don’t think that was ever offered on the 10’s. My guess is someone tried to get creative (and failed) or he might not know exactly what he has. Maybe ask him a few more questions. I’ve had this happen to me where someone thought an 18 HP cover was for a 10 because on the front of the 1960 18 HP cover part of the decal is covering the top part of the "8" in 18 and it was faded enough to make it look like a 10.
And if it is an 18 then that could be electric start.
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