Check the listing for details. WWII US Navy BU OF ORD ANGLE SOLVER MARK 10 Gunnery and Target angle each Z6096. Condition: Used. Listed at 16.14 USD. Laminated manilla (off-white) cardstock US Navy Gunnery mark ten angle solvers with the original a paper envelope to marked Mark 10 Angle solver that holds them. Each one works and can be used to calculate the protectory angle that was used when firing the WWII gunnery targets. Amazing to think this is how they learned to fire guns and the 50 Cals back then on the ships. Some of the backs of the paper folders have an assignment number on them as shown. All the wheels are unmarked. This is a real vintage item. Used for US mark 10 angle solvers for the Solution of Range on WWII Sleeve Gunnery and Target Plane Gunnery during an Overhead attack or any type of attack. Each side explains its use in detail. Great collectors item for any display about the US Navy Guns of WWII Measure 6 1/4 inches high x 6 1/4 inches x 1/8 inch thick. Track Page Views WithAuctiva's Counter