From 1919 Poland had relied on French FTs light tanks for home defense, coupled with dozens of armored cars. But this was to change in 1931 when a modernization effort was put in motion, and the army considered several designs. Alongside the Carden-Lloyd Mk.VI, which already led to the successful TK tankettes series, specifications asking for a bigger frontline tank led to the study of the American M1930 Christie and the British Vickers Mk.E designs. After the transactions with USA failed, the choice turned to Vickers, whose tank had already attracted the Soviet delegation (and was the prototype for the T-26).
In 1930 the Polish delegation signed a contract for the supply of 50 tanks, of which 12 were to be assembled at home under licence. Although the first vehicle made a positive impression, a number of disadvantages were soon found, including a sensitive (even unreliable) and overheating engine, weak armament and protection and insufficient speed. In addition, the cost of a single Mk.E was equivalent to 180,000 zlotys, making the Polish Government cancel the order in 1931 and develop its own model based on the Vickers design.
M-Move tank
,.-Move cannon
Y-Shoot cannon
I-Shoot MG
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