Ford-based lime spreader

[S LATHERON (RIP)]

The attached picture shows an original Census number showing through as I stripped the paint off a CMP 13 Cab door.

However the cab was on a LIME SPREADER used by an agricultural contractor for 20 years. The chassis is a F60S 101 1/4". w/base.
Square roof hatch model,
Welded front radiator cross bar where bonnet sits.This was hacked through when the FORD 4D diesel was stolen way back in the Sixties.
I guess it dates it at 1942/43 build.
NOTE the cab pics as found show early cab crash bar mounted behind front Bumper / Fender

BARN FIND BREAKS COVER AFTER 15 YEARS WAIT.jpg CMP 13 Cab door pic1 prime candidate for rework.jpg BARN FIND ROOF NEEDS WORK I GUESS.jpg BARN FIND 1980 FINALLY BOUGHT 1995.jpg

Although the chassis had front winch fair leads the chassis frame only had a heavy steel spacer bar between the chassis rails.
I believe that the builder of the Lime spreader had BUILT the cab onto an EX Gun tractor chassis. and used various parts of other broken/ dismantled vehicles.
So even if the number was fully readable I could not be certain that this door and this number came off the same chassis.The metal contract plates are missing.
Can any one point out where i might find the CHASSIS number on this chassis frame, which sits waiting a rebuild in a friends barn.
stephen