Not sure about the Sea King trolling motors, but years ago, my first fiberglass boat had a 45hp Sea King on it. When I ordered parts for the motor, I was informed that it was a Chrysler outboard. If Chrysler didn't sell an outboard new in 1965, it was sold to Montgomery Wards as new in 1966 with a "Sea King" cowling on the motor. Not hard to get parts for back then, but you had to watch what you were doing. Easy to work on...and a 45 HP outboard head back then was huge!!! I bet the last 150 Yamaha outboard I had, had a smaller head on it than that old Sea King....man, it would burn the fuel...
