Is this a U.S.G.I. gauge?

[Greg V]

Would this be a U.S.G.I. headspace gauge for the M1 Rifle? Probably a dumb question, seeing as how it's stamped, but I have never seen one before. It is stamped :

WALTON GAUGE CO.
ORD DEPT U.S.A.
HEADSPACE GAUGE
CAL.30
C7719C
1.942FCG 18

It measures 2&3/16 in. long and came with package and tag.

Thanks, Greg V

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