For your consideration is this 1941 production United States Navy Bureau of Ships telescopic Alidade Mk.II Mod.I. It is marked 5259 on the top plate and on the bottom are the numbers 529091-1. Other numbers are non-matching. Overall condition is good, with all glass intact and most of the finish remaining. 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.