Navigation Computer. Comprising a Navigation Computer MK III, in aluminium. Beautiful AM markings under the crown. All moving parts are functional. Markings Navigation Computer Mark III Ref 6B/231 Incomplete. A Navigational Computor MK III D Ref 6B/180, incomplete, part of the side bakelite is broken. All moving parts are functional. Nice AM markings under the lid. Some wear and patina to parts. Condition II+. Navigation computer Comprising one aluminium Navigation Computer Mk III with clear Air Ministry crown markings. All moving parts functional. Marked Navigation Computer Mark III Ref 6B/231, incomplete. One Navigational Computor Mk III D Ref 6B/180, incomplete, with one lateral bakelite section broken. All moving parts functional. Fine Air Ministry crown marking beneath the cover. Showing expected wear and patina. Condition II+.