The Clayson 1500 series cutting table was longer than before, and the brakes were hydraulic. The blade speed was higher, and the blade drive was oil-bath lubricated. The placement of the control devices was more thoughtfully considered than earlier. The differences between the various models were greater than in later Claysons. The 1520 was clearly smaller than the rest of the lineup. Starting with model 1540, the unloading auger was hydraulically controlled, and the straw reel speed changed in proportion to the threshing drum speed.

The S 1540 and S 1550 models introduced in 1973 had a straw reel behind the after-threshing reel. From the 1540 onward, the sieve movement was counteracting. In the early '70s, harvesters equipped with Ford engines were imported to Finland, whereas the last models were generally equipped with Deutz engines, except for the 1520. There was also an AL parallel model of the 1540 designed for hillside harvesting.

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