What a find.

Complete vintage aviation navigation lot manufactured by G. Felsenthal & Sons. This set includes the Air Force/Navy Type MB-9 circular computer (FSN 6605-663-4998) designed for supersonic wind solutions, complete with its original brown snap-case and the rare Operating Instructions handbook.

Also included is a Type B-2A Aircraft Navigation Plotter for sectional charts, a Wind Solution slide computer with a protective sleeve, and a Drift Angle Computer disc. All items are in excellent vintage condition with clear, legible markings and smooth mechanical movement. Ideal for collectors, historians, or flight simulation enthusiasts.