As a pure guess, when I was in bikes in the 1960's, the head tube was 1.25 inches diameter, by 20 guage. 22 G could mean that the inserted cups are larger. This would have nothing to do with the fork column.
In that case inserting the cups would possibly crack the head lugs or stretch the head tube.
You can look up the difference, but I'm still guessing.
Wilf,
As I said, pure guesswork, and ancient memory, I just looked up Brown Brothers catalogue for 1952, and find 531 head tubes 22 gauge.
So my first guess was probably wrong.
And spelling "gauge" is right.