Nice looking barn find American Bosch MJC4C antique tractor magneto. It is a 4 cylinder with clock-wise CW rotation. I think this magneto should be correct Oliver 80 and 90 tractors that use the flange mount magneto. It should work on other tractor brands using the flange mount as well. The armature is loose. It is HOT and I got a shock from it when I put a spark plug wire on it and I held it to the side of the mag and spun it over. The impulse does not catch, and will need to be clean...ed and adjusted to get it to snap properly. Great mag to have as for a spare. With a good cleaning, oiling, filing points, and adjusting impulse, you should have a Hot usable magneto. Good to rebuild also if you choose. Sold “As Is”, No Returns. Please ask any questions you may have. All international shipping goes through eBay's global shipping program. Please check out my other auctions. I have many tractor and farm related items to list soon. Thanks and Happy Bidding!!!