Mass-produced from 1941 and supplied to the U.K. under Lend-Lease. A a total of 6,889 were supplied to the British from M3 to M5A1 variants. The M3 tanks were designated Stuart I by the British, while the M3A1 version was designated Stuart III. They first saw action in the battle at Sidi Rezegh.
Characteristics are specified for vehicles with crews trained to 100%.