You are correct about the V-4's being diesel powered. They were interesting and very powerful, but they owe their good looks to the Dutch. The US maritime commission took the lines off the HMS Zwarte Zee, formerly the Dutch tug Zwarte Zee which escaped to England in 39'. The Commission modifed the lines and produced the V-4's.
The wich in the oicture is one I installed as the tow winch, probably 15+ years ago. It is not coreect, but it looked good. The V-4's actually carried, as I have learned in the last few year, an Almon A. Johnson 250 series automatic towing machine. Single drum carrying 2000+ feet of 2" cable, or there abouts. It was a big machine. I have draws of a 225 series which carried slightly less cable and it too is a big machine. I was hoping not to have to build one, but I think it may be my project for the winter because there is nowhere to go and less to do.
I would still like to try to find who made the winch I posted pictures of, but it may be lost in time.