In the early 60's, Fiat launched an effort to streamline their lineup, with the intent of making their tractors easier to market and service, thereby strengthening their position internationally. 
 
Fiat tractors had a reputation for being reliable, easy to maintain, and well priced. But not exactly for being or having a cohesive and original design language.
For the replacement of the 100 series, Fiat therefor decided to hire the help of non other than Pinninfarina.
 
Introduced in 1965, the new and officially Fiats first series, would be known as the "Diamant Series".

While the 215, 315, 415 and 615 models got the attention at launch, a new kind of tractor entered Fiats lineup. A small articulated tractor.

The small articulated concept was developed by Italian company SILMS from Brandizzo.
Like the Calzolari-developed Fiat TC 27R4, Fiat took notice of the innovative design, thinking it would fill a need in the market for a tractor with smaller dimensions than the 215 Montagna, but with many of the same attributes, that would make it more capable than a 215F or 215V in plantations and vineyards.
Fiat therefore entered a contract with SILMS, much like they did with Calzolari.
SILMS would manufacture the machine for Fiat, while Fiat would deliver all necessary components. 

The 220 adopted the 215's PTO and 6+2 gearbox, as well as the two cylinder, watercooled prechamber diesel engine, with a displacement of 1.135 cc, developing 22 hp at 2.300 rpm, and 67 nm at 1.520 rpm.

Production began in 1965, - and from then on, little is known about the 220. 

In general, little-to-no literature is available about this model. It is thought between 100 and 200 tractors were produced. But do to it not meeting sales expectations, and being relatively costly to manufacture, the model is thought to have been cancelled at the time when Fiat introduced their new "Golden Ribbon" series of tractors in 1968. As the decades rolled by, the 220 was forgotten about.

Only in recent years, as the remaining examples have been located in small farms and plantations, and put back to service by enthusiasts, have the knowledge and interest for this rare Fiat resurfaced.