British Air Ministry marked Royal Air Force Bubble Sextant Mark IXA, with lable to lid of case which reads Bubble Sextant MK.IXB No763/44 and marked on the side of the sextant:
(AM Crown)
BUBBLE SEXTANT
MARK IXA.
REF. No. 6B/218
BRIT.PATS
480112 490621
AND PENDING
Note: these were used for night time navigation aboard WWII Aircraft, such as the Avro Lancaster Bomber, and others.
British Air Ministry marked Royal Air Force Bubble Sextant Mark IXA, with lable to lid of case which reads Bubble Sextant MK.IXB No763/44 and marked on the side of the sextant:
(AM Crown)
BUBBLE SEXTANT
MARK IXA.
REF. No. 6B/218
BRIT.PATS
480112 490621
AND PENDING
Note: these were used for night time navigation aboard WWII Aircraft, such as the Avro Lancaster Bomber, and others.
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