The serial numbers are on a side plate on the engine PTO side of the combine. After serial number 39201 they switch to the 200 cid engine that was in 1978. The F2 Gleaner would remain in production until 1982 when the 'F3’ Gleaner replaced it.

Both the 'K2’ and 'F2’ combines received the newer and much improved cabs that had been in use on the bigger L and M series combines. Gleaner introduced the Model F2 combine in 1977 to replace the ‘F’ Gleaner.