M-55S - The Upgraded T-55 Sent to Ukraine

Having been in service since 1947 with over 50 state and non-state actors, the T-54/55 is the most widely produced and used tank in the world. Naturally

T-54/T-55 operators and variants - Wikipedia

Russia Ukraine update: Kremlin sending 80-year-old tanks into battle

Russia, Ukraine: T-55 Tanks

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Slovenian donated M55S survived the direct hit by a krasnopol. : r/TankPorn

T-54/T-55, Military Wiki

M-55S: Slovenian Wrath - Ground - War Thunder — official forum

What Tanks Are Going to Ukraine?

Russia hauls 1950s-era tanks out of storage to join battlefield