I do not know the full history of either of my mowers. Having said that, they both look pretty original. I put the red painted clutch on the one with the long muffler (from my parts mower). This third one had cast handles also and always appeared to me to be newer that the one with wooden handles. The cutting blades on all three measure 14 inches, not 12. When did the 14 inch models start?
Mick