The transmission at least is post 5U13273 (or the 4U equivalent) because it has the two-piece clutch shaft which would make it in the early '50s I think. I'm wavering on the dash forward though without my parts catalog because the gauges are not mounted on the separate small dash unit - I don't know when that change was made, and the governor control does not have a remote handle mounted on the governor assembly itself. The fenders are also pressed steel. I suspect the transmission and engine serial numbers might not match but only one way to find out for sure