The F-12 came out in 1932, but apparently IHC didn't have an engine ready. They used a Waukesha flat-head for a while. The IHC overhead-valve engine came out in 1933. F-12 production extended into 1938, but that was also the year that the F-14 came out (same tractor, higher engine speed, gears re-ratioed to give about same ground speeds as F-12, steering wheel raised up, long brake levers).
I always thought that the F series was phased out BEFORE the letter series was put on the market, but according to Baumheckel and Borghoff in their "International Harvester Farm Equipment Product History 1831-1985," the F-14 was made into 1940 to SN 155401, and so were the F-20 (to SN 148810) and F-30 (to SN 30221). I don't always believe everything I read in all the pretty books that come on the market, but this one looks well-researched and I am inclined to accept the information. Not everybody was enthralled with the H when it came out. It seemed underpowered compared to a rubber-tired F-20, which had a LOT bigger engine and therefore much more torque. This may have been at least part of the reason why IH continued with the older models. I remember some griping of this sort back then, when I was getting old enough to drive and thought the H and M were the most beautiful tractors I had ever seen. I still think that, but I have spent a good many hours on both F-20 and H, and I can definitely state that the F-20 (on rubber) can do more work than the H. As far as comfort goes, the F-20 is from the caveman era, while the H is quite comfortable for its time.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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