Description On outside of box: -US Navy Bu. of Ord., Mark 6 Mod.1, Inspector H.L.B., New York, New York, Date 1944 -yellow tag: 06-5864 -wood box has black paint Quadrant: -black paint -mounted on metal bar -etched on side of bar: 06-05864, 000120 -usn 6263 -part of sticker tag date: 9-26- A gunner's quadrant is a surveying tool used to accurately measure angles on a ship. It can be used when mounting equipment on a ship, for example, a stable vertical, to establish a level mounting plane.