The design of the MF 400 and 500, introduced in 1960, was ahead of its time, and in many ways, the technology was advanced. The reel speed adjustment was hydraulic. Feeding was done with a drop elevator. The threshing drum speed was adjusted using a variator from the operator's seat. The hydraulic rotation of the unloading pipe and the length adjustment of the straw elevator were also operated from the cabin. The instrumentation was extensive for its time. The steering was power-assisted, and the brakes were hydraulic disc brakes. The air intake for the engine, located behind the grain tank, passed through a rotating grille.

The threshing drum width was 94 cm in the 400 and 114 cm in the 500. Both models had six threshing bars. The upper sieve was adjustable, but the lower sieve still had to be changed in these models. The saddle-shaped two-part grain tank had a capacity of 23/28 hectoliters. The tank spanned the full width of the combine. Hazardous areas were enclosed from the start behind guard plates designed as standard equipment. The rear axle track was roughly the same as at the front. The picture shows the 400. The 500 featured a wider cabin and steps located behind the front wheel. Only the 400 model was imported to Finland starting from 1963. These models were manufactured in both England and France.

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