Military Special Use Steel Ruler Unknown Origins/Markings CV-A Prop Navy Aero

Specifications

Military Special Use Steel RulerUnknown Origins/Markings On back: CV-A PROP 11-70235 CKGA SN 0636 Numerical markings on front in mostly odd (top) and even (bottom) scaleswith corresponding (semi-drilled) colored marking dots:13, 9, 7, 5, 311, 12, 10, 8, 6, 4, 2 Measures just over 8 1/4" when fully extendedMade of steel approximately 1/16" thick which has a symbol: 10 (in a circle)followed by M332 Both sections are firmly attached and swivel easily. Item was from the estate of a Navy pilot but the family did not knowwhat it was used for. I have not seen a similar one anywhere and it looksto be hand made and possibly one of a kind. I ship promptly and pack carefully.Local pickup available PS: If you have information on this item, I would appreciate hearing from you. U.S. Navy, Airplanes, Measuring Device, Tools, WW II, Korean War, Vietnam War, Calibrating tools, Mystery Ruler,

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