[wlonkly]

This was also pointed out in the article, but the point at which it became a physical standard, and not a lettering style, was with the Gorton engravers.

(The tail of the Q is a tell -- not a straight line, not a simple shape, but identical in lettering systems based on the engravers.)

[oskarkk]

Also, 7 usually has a straight line in technical lettering, but in Gorton is curved in a specific way.