Satisfying Old Brass Pin Drill Gauge handwoven basket I really don't know anything

I really don't know anything about this one

producing jewelry boxes

6 1/4 x 4"

A fabulous set of old wooden jackstraws

completely readable

Satisfying Old Brass Pin Drill Gauge handwoven basket I really don't know anythingI believe this small brass gauge would have been used for measuring pin drill (pin vise) bits; pin drills are like miniature drills, used for precision work by machinists or jewelers, etc. This is a fairly old one, with just the center row of holes stamped: 0 10 in progression, the largest number for the smallest hole. The shape of it when I first saw it made me think of a hornbook (a small paddle of sorts, usually bearing an alphabet, used for