I have a bike frame with a serial number and little else to go on. The serial number is 3R2333. A friend gave me the frame only without a head badge. He told me that he thought it was a Hiawatha. They bought it from a neighbor about 40 years ago and it's unknown how long the neighbor had owned it. The heart crank came with the bike according to my friend. I tried to identify this with the Hiawatha images without much luck. There were a couple of bike guys that thought the rear wheel bracket was something they hadn't seen before. WIll this help anyone determine the make, model and year?