.303 Marked Gauge Tool... identity?

[mhb]

The nose of the micrometer spindle does appear to be tapered, and there may be a recess in its point, which could serve as clearance over the Berdan primer pocket's integral anvil. The tool might be intended to check primer pocket depth, if the dimensions and taper of the spindle nose are appropriate, but without dimensions, it's still a guess.
As a measuring device, it appears best suited to measuring the thickness of the web at the head of the case, and, perhaps, at the bottom of the primer pocket (spindle nose dimensions permitting), since the support post would bear on the inside bottom of the case itself, and the tip of the post is the only fixed reference surface on the tool.
It would seem that a tool intended to measure the thickness of the case head web should bear more broadly on the base of the case, while one for measurement of primer seating depth would better support the case with its base against a reference surface.
Perhaps someone will know what it actually is, or come-up with a better guess.

mhb - MIke

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[browningautorifle]

there may be a recess in its point, which could serve as clearance over the Berdan primer pocket's integral anvil.

That never even occurred to me, I was considering it for boxer primed cases...