This is a shocking revelation.I believe the "hexes" are not mathematically perfect, and you will do better measuring rather than calculating.
The fact that you are shocked gives an indication as to how close they are to regular. They are not off that much. I think I found this out when I was trying to help someone print a vasl map. He couldn't get the sizes to match, and I could not either. I suspect this had something to do with the size of the paper that Avalon Hill had available, but that's only a guess.This is a shocking revelation.
The mystery gos back to Panzerblitz, the first Geoboard game Avalon hill produced.Like to hear the story of how the 1970's draftsman laid out these slightly elongated hexagons.
Or perhaps he drew one row of perfect hexagons, then photographed them at a slight angle, then used that negative to "stamp" a board's worth of rows? No, that would change the width of the hex lines at "upper" vs "lower."
How does this relate to that run of SL boards that don't match up? 1-4 IIRC?
Did Monarch print boards using a roll of paper, then slit it into strips and cut to length longways? Wondering about the precision of the cutting tools & how they were designed. Or did a human watch & adjust every cut?
I was surprised to see that (as of 1959) this is exact... Knowing that the meter is defined in terms of basic physical properties, I assumed that the 25.4 conversion was only an approximation. Who knew that the yard was redefined in 1959 so that this conversion is exact?!25.4