Well, there was some lag between introducing a new model for Soviet army and export permit.The export T-72 tanks had worse armor than the T-72A from 1979.
T-72A (172M-1) - was adopted into service in 1979
T-72M (172M-E3), Warsaw pact model with some T-72A's features, but old armor - export permit in 1980
T-72M1 (172M-E5), basically a Warsaw pact T-72A - export permit in 1983
+worse ammunition, usually
P.S. My previous post was hidden for some reason. Can someone ask a moderator why?