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 - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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