Well, you could try Googling on 1980's windlasses, cast
aluminum housings, and see what comes up.
Or, you could take that little plate off the top and have a look at what's in there, it might be well to know. Our old
Simpson Lawrence had a bicycle chain. Truly. Don't laugh, they all had 'em.
Somewhere on that casting, there may be letters or numbers, if you can highlight them or post them,maybe we can help more.
Ann