This is a "kit" built self steering wind vane
by M Company. The previous owner of my boat
used it during their circumnavigation
and made several improvements to it (he was an engineer). I have the original manual and brochures for it which claim it is good for boats up to 57 feet due to it's unique design. The vane doesn't attempt to control the rudder
directly, rather, it uses a small rudder
behind the rudder.
It would obviously need some modification to fit to other boats (it comes off of an Olympic Adventure), but wouldn't be difficult to weld some tube extensions to adapt any shape of transom. The rudder could probably use a sanding
job to clean it up some.
Pickup in Titusville, FL. $800 OBO.