Very hard to find original American Bosch U1 single-cylinder rotary magneto. It is as found from an old collector’s estate and in usable condition for its age. It mounts on a 2 inch square hole pattern and the threads are in great shape. It is clockwise rotation and turns smoothly with no noticeable wear in the bearings. It has good magnetic pull and put out a nice, hot spark that is sure to run an engine if set up properly. Everything inside the points cover looks to be in nice shape. It has some deterioration on the base and also a small crack on each side as I’ve pointed out in the photos. This doesn’t seem to affect its performance and would be easy to remedy with your method of choice. These magnetos are pretty tough to find so if you need one don’t miss out on this one. The pictures tell the story. It would also make a great spare on the shelf.