If Tony Galazan serial numbered his brass chamber gauges being discussed, the one shown in the link provided below would be Serial Number 1. (I couldnt figure out how to post the image directly so provided the link.)
I made this one almost 40 years ago to measure the chamber length for primarily A. H. Fox doubles, my main collecting interest.
Tony seen me using it and asked what it was. He liked the idea and asked if he could make some. Sure, why not.
Back then the gauges and tools for measuring chokes, chambers and wall thickness were less common and this one worked fine for its intended use.
And also, the good ole American dime (0.703 diameter) was useful in checking Modified and Full chokes in a 12 gauge. And much to the chagrin of some, I still use a dime today. (Sorry!)
So a precision instrument it isnt but still quite handy for what it is.
Jolly
https://i.imgur.com/5IhW2sV.jpg?1
