On August 12, 1954 Zastava signed a cooperation agreement with Fiat. Three months later, Kragujevac began assembling Fiat 1400, Fiat 1100 B and Fiat AP-55 Campagnola. Fiat 1400 was Zastava's first assembled automobile. In October 1955 assembly of the Fiat 600 began. Total vehicle production in 1955 was 1,044.