WWII US NAVY ''OFFICER OF THE DECK'' TELESCOPE SPYGLASS: Wollensak Optical Co Rochester NY US Navy BU. Ships O.O.D N.G.F. Type 10X Mark II Serial No 4511 1942, 23'' cylinder with 1 1/2'' objective, focus by twisting the eyepiece making it weather-proof. Encased in a wooden box wiht brass plaque Kollmorgen Optical Corporation 10 Power Officer of the Deck Spyglass MK.11 U.S.N. BU. Ships Serial No 1383, swivel locks for double latches, 24 3/4'' x 3 3/4'' x 3 3/4''.