I don't know if there was something unique about the winch on that particular tug, but if yours is to 1:30 (to match the Mantua scale), a search for "1:30 model deck winch" gives lots of hits. Since its google doing the search, there are plenty the wrong scale, but even so..........
1:32 is a popular tug scale, probably a wide choice there, and its near enough to not have the difference noted.