Most of the Type 2 Ho-I tanks built had the short 75mm Type 99 tank gun, in 1943 one tank was tested with an experimental high-velocity 57mm gun. This Tank was basically first gen prototype which later became Chi To and Chi To late. Built on the Ho-I platform equiped with the new Experimental 57mm Anti Tank gun(larger version of the Type 1 47mm gun) which was able to penetrate up to 100mm with HEAT shell.
(No irl images can be found atm. Only written docs remain)
(IJA Experimental 57mm anti-tank gun)
