The Johnson Seahorse QD was manufactured from 1949-1963 and were OMC's flagship line of motors. These made after 1959 had a new cowling but the rest is pretty much the same. They were made to be operated with a standard tiller, or optional "Ship Master Remote".
The motor for my project was purchased from eBay at a cost of $150 and local pickup near my home. You save a lot of money if you can avoid shipping.