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You have to remember that Badwin pull type combines were back in the 1920s and Gleaner purchased Badwin so they had the first pick of letters or numbers for those models. Aside from that though, there is some sense to the lettering of models which followed. Here"s how. Gleaner had their main self propelled combines started in the 1950s with the model A which was a 30" cylinder and had straw walkers, Model R which used a Raddle instead of Walkers, Model AB which was a rice version of the model A, Model AH was a hillside model A, and the Model T [T2 2 rows of soybeans or T3 3 rows of soybeans] which was a small version machine for smaller farms. It had a 23" cylinder. The T was only made in 1954. In 1960, the model C with its 40" cylinder sufficed the larger farmers. It had different versions as a CR [rice], CT [tracks], and CH [hillside]. In 1962, the model E replaced the model T. It had a 27" cylinder and 3 straw walkers and was perfect for small farms. 2 row corn or 8-10-12foot platforms were available. They built over 21,000 of them from 1962-1968. The 1968 model was named the model EIII because the E had some improvements during 1964-66? and although it was still a model E, some referred to it as a model EII. Hence the Model EIII in 1968 - only year built. In 1964-67, the AII and CII were introduced improved versions of the A and C. Better cabs and more cleaning area, plus bigger grain tanks. Now in 1968, They had the EIII and want to expand from the AII and CII, so gleaner introduced the model F, model G. The F was a 37" cylinder and replaced the model AII while the G had a 44" cylinder and replaced the CII. The model G was produced until 1972. There was an FR [rice] and a GH [hillside]. The model K replaced the model EIII in 1969. It sported the GM 250 6 cylinder engine with a better cab and slightly larger grain tank. It was produced until 1976. The model L replaced the model G in 1972. 48" cylinder with open concave and was filled with electronic age items and a newly designed cab for better comfort. In 1973, the model M followed the L for smaller customers. It had a 40" cylinder with all the comforts of the L. It also had a Hillside [M hillside] version and a hydro transmission version called the MH. In 1977, 2 series came out for the K2, F2, M2, and L2. The K2 and F2 shared the Allis 4 cylinder 200cu in diesel engine or GM 250 for the K2 or GM 292 for the F2. They also got the new styled cabs like the L/M had back in 1972. The M2 and L2 shared the 301 or 426 diesel engines doing away with the GM 350 v8 engines. Cleaning capacities were made larger on all models in 1978. In 1983, gleaner celebrated its 60th year, so add the 3 series models F3, M3, and L3. There were not any K3"s. In 1978, the N6 made its appearance as the first rotary combine followed by the N5 and N7 in 1979 until 1985 when Allis Chalmers was bought out by Duetz. Duetz-Allis made the R series combines; R5,R6, and R7. Later AGCO, Allis Gleaner Company, which is still in business today have the R50, R52, R60, C60, R62, R65, R72, and R75. Correct me if I"m wrong on the AGCO models?
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