Comparing: Black Prince vs. O-Ni

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.

A further development of the O-I with improved anti-tank guns. The military command's plan was to improve the earlier models and achieve a higher level of armor protection on the vehicle. Existed only in blueprints. No finished prototypes were built and the vehicle never saw action.