#OTD in 1943 GKO decree #3289ss required an improvement across the board in the armament of Soviet tanks. In part, the IS tanks were now to be built with 85 mm instead of 76 mm guns. Such a tank went into production in September of 1943. #tanks #history #WW2

https://www.tankarchives.ca/2020/07/an-is-in-hand.html