T-55/Type 59

The T-55, is the most produced MBT in the world... around 86-100k built by different countries, it was an upgrade for the T-54, and served with the Soviets and the Eastern bloc, in China as the Type 59, and other countries and militants that still use it up with mods up untill this day
The Type 59, is a licensed-built T-55 under the Chinese, the main visual difference being the ventilator, the Type 59 is notoriously known with the Tank Man during the 1989 Tinanmen Incident