U.S. Gauge of New York manufactured this altimeter under Contract No. NOs-78078. Adding slight pressure through the fitting on the back causes movement of the needle (used my mouth and not compressed air), I am assuming it works OK but, it is NOT tested. Appears to be in original condition and shows no signs of being tampered with. The plate under the needle says BU. AERO U.S. NAVY and below that is the U.S. Gauge logo.
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