T-54-2 fitted with the ZET-1 vehicle protection system.
It has net structure centered on vehicles main armament and flipper-type side plates.

T-54M (Ob'yekt 137M) (mid-1960s) – Upgrade program to bring T-54s up to T-55 standard.

T-54M (Ob'yekt 137M) (1977) – Additional upgrades, including OPVT snorkel and KTD-1 laser rangefinder.

T-54AM (Ob'yekt 137M) (mid-1960s) – Further upgrades, including increased ammunition, new radios, new V-55 engine.
Some received new RMSh track and drive sprocket developed for the T-72 tank in the late 1970s and early 1980s.
Similar programs were carried out in other countries (T-54Z, T-54AZ, T-54AMZ for Zusatzausrüstung, 'additional equipment' in East Germany, T-54AR Řeka/Reka, 'river', with fording snorkel in Czechoslovakia).
T-54-2 fitted with the ZET-1 vehicle protection system. It has net structure centered on vehicles main armament and flipper-type side plates.
T-54M (Ob'yekt 137M) (mid-1960s) – Upgrade program to bring T-54s up to T-55 standard.
T-54M (Ob'yekt 137M) (1977) – Additional upgrades, including OPVT snorkel and KTD-1 laser rangefinder.
T-54AM (Ob'yekt 137M) (mid-1960s) – Further upgrades, including increased ammunition, new radios, new V-55 engine. Some received new RMSh track and drive sprocket developed for the T-72 tank in the late 1970s and early 1980s. Similar programs were carried out in other countries (T-54Z, T-54AZ, T-54AMZ for Zusatzausrüstung, 'additional equipment' in East Germany, T-54AR Řeka/Reka, 'river', with fording snorkel in Czechoslovakia).
T-54/T-55 operators and variants