paulfarber

"Not to be confused with the M-5H-6 trucks, exclusively fabricated for and used by the USN and USMC, some 3,500 M-5-6 trucks were produced by International Harvester on a Quartermaster Corps foreign aid order from 1941 on, the main recipient being the Soviet Union.
Though the majority was of the 6x4 type with 3,000 pieces, the vehicle shown here is one out of 500 M-5-6 produced."

So without knowing the exact IH model, its could go either way.

If its an M-5-6 then having one of only 3,500 produced is a definite negative. I don't know what the production of the M-5H-6 was... but I'm sure google does,.