I think they only made a twin 5hp and a one cylinder 2.5hp. I have two of the singles. One is a ’48 model and one is a ’56 model. I don’t think I’ve seen a 3hp Gale, but there’s a lot I don’t know.
The Gale 2.5hp single was made 1940-1942. After the war they made a 3hp single 1945-1963. FrankR has a collection of them in just about every color they came in….
(looks like Sea King may have sold a 3hp single pre-war!)
Gale made a 3hp identical to the Johnson 3hp in europe, until 1962, some stock was still available until 1965. They were painted black and cream or orange and cream depending on the year. Here’s a video of one.