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This wasn't just how it was in Europe, it was like this everywhere in the world. When the units of measure originated, sophistication of measuring equipment and standards were obviously very low. ...

I think I found the issue. The old German "zoll" unit originated before the standardization of units between countries. So it could have originally been some arbitrary number "close" to an actual...

You've been all up and down it where and with whom? The numbers from the Zoll/inch column convert pretty much exactly to those in the mm column. "Engl zoll" would be English inch.

"Zoll" is German for "inch."