The new model series introduced in the Allgaier years 1952-53 was developed by Porsche in Stuttgart. To increase cost efficiency, as many parts as possible were the same across different models. Much less light alloy was used than in the original AP 17 model. The engine came in 1-, 2-, 3-, and 4-cylinder versions. The engine was an air-cooled swirl chamber diesel. The A 111 had 4 forward and 4 reverse gears, while the others had 5 forward and 1 reverse. The gearboxes were manufactured by Getrag and ZF. The A 133 and A 144 featured a Voith torque converter. The basic model of the A 111 had a short hood covering only the engine and a long wheelbase that allowed attachments to be mounted under the tractor. The long A 111 L had a full-length hood. Later this became the standard version, alongside a short K version with a 150 cm wheelbase. Mainly the A 133 model was imported to Finland. The largest A 144 remained quite rare; only about 150 units were made under the Allgaier brand.

From the beginning of 1956, the brand changed to Porsche-Diesel, and in the summer of the same year, the model designation's letter A was changed to P.

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