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WWII Japanese Pilot Wrist Compass
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A large wrist compass within a metal case on a leather strap. The compass is about 1 1/4 inches in diameter and 1/2 inch thick. There is a rotating serrated dial on top of the compass with a side latch. When the latch is released, the dial can be turned, which then turns the interior dial of the compass and permits the directional markers to be adjusted. The directional arrow within the compass still moves upon releasing another side latch that keeps it locked into place. These combined mechanisms allowed the pilot to release the arrow and allow it to turn, thus finding the north direction. He could then release the exterior dial and turn it until the interior direction markers matched the reading of the compass arrow. The leather wrist band shows wear but remains supple.