I have a new old stock Michigan J-122 aluminum propeller for the late 1920s era Johnson K-45 and K-50 models. It is listed as 10-1/4 inches in diameter and 13 inches in pitch. Comes in the original box, with a "Genuine Michigan Propeller" sticker still partially stuck to the prop. Box is in nice shape, but looks to be an early one, plain brown, with only a Michigan label on the side. Asking $65.00, postage in the U.S. included. Photos available upon request.
Email: csr112-n AT twcny DOT rr DOT com