Maybe somebody can tell me what these are. The gauges are roughly 9mm so I wound up with them. The came out of the UK, reportedly from Holland & Holland (hence the H&H). Given that they are H&H, I can’t imagine that they are 9x19 related in any way…but!
Tony or John or whoever, what do you make of these?
The top gauge has a diameter of 0.3855 inch
The middle gauge has a diameter of 0.3915 inch
The bottom gauge has a diameter of 0.3635 inch
I could make some guesses on these but truly have no idea of their intended use.