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Please help any info on this WW1 Pocket Barometer

EODONE

EODONE

Ordnance Approved
Folks I'm of an oppinion that this is a WW1 aviator pocket barometer ( Ballonist?) the dial on the top adjusts similar to a primatic compas to set altitude it was made by Henry Khann & Co , San francisco and that is all I know, hear say is that it was used by Arty spotters but open to any idea's.

REgards JohnBAROMETER a.jpgBAROMETER b.jpg
 
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