Happy holidays to you, too. I’m an American in a foreign country &
had to just think about Thanksgiving instead of actually having the
day off & celebrating.
Since I’m in Europe, I have both the American & metric size
measurers. I put my US size 5 sizer ring on my metric ring stick & it
comes to 49mm circumference, just like your chart showed. And that
matches the chart I have, too, in Harold O’Connor’s Reference Guide.
Also, that size 5 is approx 15 3/4mm in diameter (the other
measurement on the ring stick). I would say your charts are right on
Designs by Lisa Gallagher