Marcello
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Tank T-55 batch production has begun in 1958, but in 1960 this tank modernise and continue to let out under the same name - T-55. In 1963 start to let out new tank T-55A.
T-55 (1960) differed from T-55 (1958) here than:
"Since 1960 the changes raising it technical characteristics have been entered into a tank design. Them concerned a duplicating hydropneumatic drive of management of a 19-disk main friction clutch, installation of the prismatic device at the tipper-of and air-liquid system of clearing of viewing devices of the mechanic-driver."
I.e. for change Fire Control in game on this tank have established for the tipper-of of a gun of the tank - the new device of an aiming.
Sorry for my bad English. If you have not understood me - write about it to me and I will try to translate to another the text.
source (Russian):
http://armoured.vif2.ru/t-55.htm
http://armor.kiev.ua/Tanks/Modern/T55/index.php
http://www.militaryparitet.com/nomen...iabrontanki/9/