Comparing: BT-7 artillery vs. Stuart I-IV

In 1934–1935 the design bureau of the Kharkiv Locomotive Factory developed this artillery modification of the BT-7. The new elliptical turret was equipped with the 76.2-mm CT-28 gun. In addition, some vehicles received new radio stations. A total of 155 artillery BT-7s were manufactured. The vehicles saw combat on the Karelian Isthmus, in Manchuria, and during the first period of the Great Patriotic War.

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.