The most popular combine harvester in Finland in the early 1980s. The 500 was the first to come onto the market, and in 1979 the 600 and 650 were introduced, which were developed based on the 410. The difference between the 600 and 650 was the cutting width. Compared to previous models, the updates included new engines, a larger grain tank, a re-positioned unloading auger further forward, and new steel fingers. In 1982, the heater was moved from the roof inside the cabin and equipped with humidification, and the height of the combine was reduced. The 500 was sold in Central Europe as the New Holland 500. Starting in 1983, the 500 was also manufactured at the Morgongåva factory in Sweden, which was acquired by Sampo Rosenlew.

The SR 500-650 were very lightweight combines. Consequently, this was reflected in the sheet metal construction, and the durability was not good in every respect. The 600/650 clearly had fewer problems than the 500.

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