The Fiat-Ansaldo M13/40 was an Italian medium tank (“M” for Medio (medium) according to the Italian tank weight standards at the time: 13 tonnes was the scheduled weight and 1940 the initial year of production), designed to replace the Fiat L3, the Fiat L6/40 and the Fiat M11/39 in the Italian Army at the start of World War II. The design was influenced by the British Vickers 6-Ton and was based on the modified chassis of the earlier Fiat M11/39. Indeed, M11/39 production was cut short in order to get the M13/40 into production.
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