Well, that’s interesting!
I have known that German needles were sized differently than U.S. sizing, but didn’t pay attention to other Country’s methodology. The proof came while I was cleaning up my needle mess. It isn’t just those two countries. Why do I care, you ask. Because a .5mm in needle sizing can make a difference in your gauge. I found that not all size 2, 3, 6, and 10 1/2 needles are the same mm. What say you? Do you pay attention to mm size or the number assigned to the needle?