Aircraft Sextant AN5854-1 and Carrying Case

This is a WWII/Post-War-era Aircraft Sextant AN5854-1, made by Bausch and Lomb, with Carrying Case and suspension hook (for hanging the sextant below the navigator's dome).  This sextant was used by air navigators of the US Army Air Force, US Navy, and US Air Force. This sextant is stamped USN.  The sextant appears to be intact. The knob rotates to position the prism. The rheostat knob rotates. The bubble knob rotates but the bubble is not present. The horizon slide knob is very stiff but still slides. The sun filter dial does not rotate. Maintenance by a knowledgeable technician is suggested. Included is a small box containing a replacement lamp and lens cleaning tissues.  Absent is the separate battery module.  The rubber eyepiece is has deteriorated with age. This sextant is sold for display or as core for parts.  Here is some interesting information from Deborah Warner's Celestial Navigation Aloft: Aeronautical Sextants in the US:  Bausch & Lomb's last air sextant was their mod