This flywheel is from a 1955 John Deere 40T and should fit any 40 model (40C, 40S, 40T, 40U, 40W, 40V, 40H).

Good condition.

Part number is M1833T. The ring gear is NOT included (together, the flywheel and the ring gear are part number AM1778T). 

It is item #16 in the diagram.