The C.H.Wendell book on Oliver shows this tractor which is a OC-3 which superceded the HG but was about the same size and styling
The OC-3 model was produced from 1951 to 1957
The adaption was carried out by M.F.D. incorporated of San Jose, California to give a clearance of 72″.
It does not say what the specific use of the conversion was for but does the Californian location give a clue , Vineyards or fruit production of some description ?? spraying or dusting with operator above out of spray area.
I wonder if anybody from USA who views Forum can thro any light on this tractor
regards Joe Paget