Picked these up at SLICS 2019 as a set. The table owner was not present and a friend of his was manning the table and he did not know anything about these gauges and neither do I.
Length is 33.21mm
I assume the first one shown below is a chamber gauge for 7.62x39mm but I could be wrong:
"Head" end of the gauge, diameter = 11.25mm
Below is the other gauge,
39.42mm long and 3mm thick
Writing on the front of the gauge: 1,3 i - 134 - K - 1 MASSI 2b 1,115
Inscribed on the back is the number 205
Any help with information or discussion is most appreciated.