“In Russian nomenclature, one type would be called 41mm, even if it was 40mm, to avoid battlefield mis-shipments.”
Yes, I remember reading that way back when there was a Soviet Union. They had to deal with dozens of ethnic groups in their conscript military and a lot of them didn’t do Russian very well. But they could relay numbers good enough. Null, odin dva tre...
It makes perfect sense to me. Only engineers would need to know that the 81mm mortar was actually 82.