Another example of a WWI marching compass, beautifully rendered and preserved! The compass card is jewelled. Readings may be taken at eye level via a notch in the bail and a sighting line in the cover's lens. A superb device, all around.
The patent number 22,598 was filed in 1914 by Francis Edward Collinson, Manufacturer and Short & Mason Ltd., both of Aneroid Works, McDonald Rd., Walthamstow, London, NE.