[1] At the outbreak of the Italo-Turkish War of 1911, the Royal Italian Army, whose motorisation had only begun a few years before, was chiefly equipped with Fiat 15 trucks.
After a positive experience on the field, the army handed out additional procurements contracts of trucks for tactical and logistical use, to both Fiat and other manufacturers.
These were the Royal Italian Army main armored vehicle and were used in riot control and later in the war to quickly exploit infantry breakthroughs.
The 1Z was powered by the Tipo 61 4,940 cc side valve, monobloc inline four-cylinder engine delivering 70 hp (52 kW) at 2,200 rpm.
Main differences from the Theta's mechanicals were wider axle tracks, and tyres and metal disc wheels more suited to military use.