Here is a sharp looking refurbished American Bosch MJC4C 334 clockwise,four cylinder flange mount magneto for an Oliver model 10. It has a 25 degree ignition lag per American Bosch for the 1937 model. For some reason, the 1938 model uses a 20 degree lag. Many other applications also, including LeRoi. If this is what is needed, we can have it changed to 20 degrees on request. It has been comlpetely disassembled, blasted, primed and painted, bearings washed and repacked, magnets charged, components tested to factory specs and replaced as necessary, has new gasket and handy timing window for mounting to the tractor. It has been bench tested good and hot as it should be. It may fit other applications as well. Will ship postpaid to US addresses, may return in 10 days if not pleased, payment due in 5 days. If any questions, please ask the oldcroak! Thanks for looking!