How big are those City Hexes for Viridistan?

This may be a long shot question. If you looked at the images I posted yesterday they were scanned from the original Viridistan City Map. The city map uses numbered hexes. The only problem is that it appears that nowhere the size of the hexes in feet (or yards) is noted.

I been assuming they are 120 feet as if you put the big map of Viridistan next to the big map of City-State the building are of equivalent size. The hexes are very close in size to the square grid of CSIO. But if it was stated somewhat how big those hexes really were I sure like to know.