Re: T-72 varients
T-72 : some (Soviet-only) tanks did have corundum-based composite armour similar to T-64A, but of worse quality.
T-72 : Baseline model, turret cast steel. Both got glacis composition 80mm steel + 105mm composite + 20mm steel.
T-72M : Improved (M-E4 got 44 rounds, generally all got LRF, side skirts and smoke dischargers). Glacis 60 steel+105 composite+50 steel.
T-72A (Dolly Parton) : Composite turret, glacis same as T-72M (at first), later reinforced with 17mm HHS plate.
T-72M1 : Export version of T-72A, almost same, AFAIK all got the HHS plate from the beginning.
T-72B (Super Dolly Parton) : Thickened turret front, new composite array, glacis got 30mm HHS instead of 17mm. Capable of missile launch (B) or without missiles (B1)
T-72BM : Newer composite, better FC.
T-90 : first pieces generally even more upgraded T-72BM with newer FC and (some) with TI sights.
T-72S : Export version, conflicting data - some sources state export version of B, some state it's A/M1 with B FC and ERA which would mean weaker armour than 72B.
Moreover, T-72 M and M1 do differ a bit depending on manufacturer. from what I've seen, with armour quality (mostly the composites) Russian are the best, then Czechoslovakia and then Poland. With night sights it seems Czechoslovakian are marginally better compared to Polish and Russian (speaking of basic T-72M/M1 package).
Plus there's the Yugo M-84(T-72M)/M-84A(M1) and Romanian TR-125 or how is it called...
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