Ran across this TM in a sale and took it home. Am about 90% done with restoring but just don’t have the time and $ has become an issue recently. Best info I can find on it:
This Minn Kota UWR model was manufactured in the mid to late 1960's. It's name is based on the location of the motor unit, which was among the first to be underwater when in use. The UWR could be operated on 6, 12, 18, or 24 volts, had 3 speeds forward (plus reverse on the deluxe version), and produced a maximum of 24 pounds of thrust.
Everything works on it and another coat of paint was about all I was going to do to it. There are some props for it on ebay for around $20 that look real nice.