The gunner's stiletto was used to measure bore & shot diameter in conjunction with a compass/dividers (rare version opens up to be a compass for itself). Powder charge was measured by sticking the blade into a known volume charge cup.
Interesting note, since the "regular" stiletto was often forbidden to carry by civilians, as being an assassin's weapon, the gunner's stiletts has been regarded as a legit tool of the trade. Some researchers suspect that a relatively large amount of marked blade stilettos exist to these days because this was an attempt to surpass the rule.
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