Comparing: Black Prince vs. IS

Developed from 1943 through 1945 on the basis of the Churchill tank. It featured a wider and elongated hull to carry the upgraded turret with a 17-pounder gun. A total of six Black Prince prototypes were produced from 1944 through 1945. A few vehicles underwent trials but never saw action.

The IS-1 (IS-85) heavy tank was a thorough modernization of the KV-1. The tank featured the 85-mm D-5T gun. The IS-1 entered mass production in October 1943, but work was discontinued at the beginning of 1944, as the IS-2 (IS-122) tank entered mass production in December 1943. A total of 107 vehicles were manufactured.