For your consideration is this 1941 production United States Navy Bureau of Ships telescopic Alidade Mk.II Mod.3 No.2092, manufactured by Ajax Engineering Company. It is marked 480723-1 on the bottom of the tube. Overall condition is fair, with cracks in the side glass and wear to the finish. This measures 14.25” long on a 10” base and with an overall height of 6.5”. The green leveling vial is present and intact. The brass degrees ring has some tarnish. The mirror box does not slide on or off the rail freely.