Gale made 5’s all through the 1950’s and I’d guess that one is a 1955 or 56 , but I could be off a year or so. The OMC tiller/throttle handles from 1954 up into the early 1960s for 5 to 10 HP should interchange, (maybe the 15s and 18s also) although the ones from 1959 or 1960 up will look quite a bit different.
Dave