Comparing: T-54 first prototype vs. T25 Pilot Number 1

Developed at Factory No. 183 in 1944. It was based on the T-44, with many components modified to enhance the armor and armament of the new vehicle. According to one source, the first prototype was built at the end of 1944. However, some other sources mention another date—January 1945. The tank underwent trials in March and April 1945, but never entered mass production.

Developed by the United States Army Ordnance Corps on the basis of the mass-produced T23 tank with a 90-mm gun and reinforced armor. After the creation of two prototypes, 40 other vehicles were manufactured.