In the spring of 1957, Fiat introduced a small tractor numbered 18. Instead of the number, it is known by its nickname "La Piccola" (The Little One). The design was completely new, and the same lines were later applied to larger models as well. The engine was a 2-cylinder water-cooled diesel. The 1.1-liter engine produced 19 hp. It had 6+2 gears, all controlled with a single lever. There were as many as three power take-offs: in addition to the conventional one, there was another shaft at the rear running at the same speed as the engine, and additionally, a separate shaft was located near the rear wheel for attaching mounted implements. Considering this, the ground clearance was quite high. The hydraulic lift was sized according to standards. A differential lock was not a very common feature in this size category, but Fiat included it. The rear-wheel-drive basic tractor could be converted to four-wheel drive afterward. There were several model versions; besides the standard four-wheel-drive model, for example, there was "La Montanina," a low center of gravity version with four-wheel steering and all wheels being 20 inches.

In 1958, the model designation changed to 211R. Power increased to 20 horsepower, but otherwise, the changes were minor. In 1965, the design was updated to angular shapes, and the model designation became 215.

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