Fahr's late 1960s lineup consisted of three models, which were only slightly updated versions of their predecessors. The improved edition of the old M 40, the M 44, was on the market for only a couple of years, but the M 66 and M 88 continued into the 1970s. The engines placed on the side of the combine harvester were air-cooled Deutz engines, except for the M 44. The speed of the threshing drum was adjusted in the smaller models by changing the sprocket.

For the year 1968, the appearance of the rear end was redesigned with a modern angular style. The former M 44 was replaced by a downsized version of the M 66’s engine to a 3-cylinder and a cutting width of 225 centimeters, but later it was increased back to 255 centimeters. A parallel model, the M 66 S, was introduced, featuring a 3.8-liter four-cylinder engine, a grain tank that was 2 hectoliters larger, threshing shoes that were 55 cm longer, and bigger tires.

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