The first combine harvester from Dronningborg was the D-900, introduced in 1959. It remained in production for nearly 20 years and was almost until the end the most popular combine harvester in Denmark. The D-880 was a simplified version of the D-900. It featured, among other things, manual mechanical adjustment of the cutter bar height using a lever. The D-880/900 was somewhat unusual in its dimensions: the threshing drum width was 112 cm, which was very narrow compared to the 229 cm cutting width. It had 5 threshing bars (straw walkers), but they were quite short. The overall length of the combine was comparable to the smallest combines on the market. Initially, the engine was either a Leyland 50 hp gasoline engine or a 1.8-liter Perkins 4.107 (44 hp), later replaced by a 2.5-liter Perkins 4.154. There were only two gears, and the driving direction was changed with a directional reverser. The speed and length adjustments for the unloading auger were controlled from the cab. The first picture shows the 1961 model, and the latter ones the 1971 model, which featured newer paintwork.

Larger Dronningborg models had to wait until 1965, when the 10-foot D-1500 was introduced. The only feature inherited from the smaller model was the width of the threshing mechanism. The threshing drum diameter was 15 cm larger, and the straw walkers were 125 cm longer. The engine was a 78-horsepower Perkins 4.236. The bigger sibling of the D-1500, the D-1800, was introduced in 1968. It featured a 105-horsepower 6-cylinder engine and either 12-foot or 10-foot cutting widths. Later, these models were combined into the D-1600, which had a lower-powered 6-cylinder engine, longer straw walkers, but a smaller sieve and smaller threshing drum diameter.

In 1969, the mid-range model D-1200 was introduced, featuring a 70-horsepower engine and a 265 cm cutting width. The threshing drum was the same as in the smaller model, but the threshing mechanism was almost as long as in the larger models. All these Dronningborg models had a sack-loading platform alongside the grain tank. From the D-1200 onwards, hydraulic rotation and reverse rotation of the unloading auger, a differential lock, and electrical rotation speed indicators (for example, on elevators) were standard features.

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