Conn 50B Alto research model
Date: 1937. Owned by Steve Hanson.
This instrument, which as you can see wasn't finished beyond rough soldering, was built in 1937 according to the serial number. It was found together with a number of other experimental instruments. It doesn't have any markings or engravings other than the serial number. It appears to be either a 50B Alto (1928-1930) or a 34B (officially 1961-1969). I am listing it as a 50B because the production dates for that instrument are a lot closer than for the 34B.