[KraMax]

Don
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OK, when were the IS-IIIM's taken out of service then ?
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Here that I have found about modernised tanks IS-3M:

"It is necessary to underline, that modernisation has substantially raised reliability of the tank. However its century has already been measured. After modernisation tanks went to parks where were put on long-term storage."

Also it were known that some tanks are transferred Warsaw Pact, Korea, Egypt and other.

I.e. these tanks rose in a reserve of army of the USSR.