Though this might be of interest. I believe it was originally a Havas Mark 1 two man sub. Seller told me it works but looking at the battery box and controls it is hard to believe that is true. Maybe in fresh water you could get away with this set up. I was told by the seller the front diver controls depth and rear diver turns left and right. Hard to believe that is how they sold these but I have no personal knowledge of these and could not find any details on line. Better I let someone with actual knowledge comment. Current asking price is in the link. I will leave that alone as well..
https://barnfinds.com/never-seen-one-19 ... submarine/
I have failed to find out much on any of the Havas sub models. I believe Ivan Torr's Havas MK3 is on display in Las Vegas. That is the only one I could find in the USA but I expect others are better informed. If anyone has a source for more information I would be very interested in learning more.