An authentic World War II U.S. Army / Army Air Corps pocket compass, manufactured by the renowned watchmaker Wittnauer (Longines-Wittnauer Co.) circa 1940–1945.  Designed in a classic hunter-case pocket watch style to protect the glass crystal during field operation, the front cover bears the crisp, stamped official military marking "U.S.".  Key Features & Technical Details: Maker: Wittnauer (clearly marked on the dial below 360°).  Jeweled Bearing: Features a synthetic ruby endstone visible at the center pivot. This high-precision horological detail minimizes friction and allows an exceptionally smooth needle movement.  Automatic Needle Lock: Equipped with an internal locking mechanism (Acu-Lock) that automatically lifts the needle off the jewel pivot when the cover is closed, preventing transit damage.  Dial: Features a 360-degree scale, 8-point compass rose, and Fleur-de-lis North marker with original vintage radium luminous accents.  Condition: Functionality: 100% Fully functional. The magnetic needle moves freely and settles accurately to North. The cover latch and push-button spring release work smoothly, and the needle-lock mechanism functions properly when closing the lid.  Cosmetics: Untouched vintage condition with a original, authentic age-patina. Minor surface wear consistent with age and military field use. The glass crystal is intact and clear.