Offered is an 18 carat gold miniature barometer, altimeter, compass compendium. It is Hallmarked with the sponsor’s mark B&S (probably Barnett & Scott), a Leopards head (for London Assay Office), the date letter Q (1891 – 1892), a crown, and 18. The outside diameter is 32.25-mm (1.25-inches). The spring hunter case opens by depressing the knurled knob. The knob is also used to rotate the altitude chapter ring. Note that when the barometer was placed in a ziplock bag, and a slight pressure was applied, the needle moved. The back of case is monogrammed. The item “Rare Miniature Altimeter Barometer Compass Compendium 18 Carat Gold Hallmarked” is in sale since Sunday, January 03, 2016. This item is in the category “Antiques\Science & Medicine (Pre-1930)\Scientific Instruments\Barometers”. The seller is “surcomp” and is located in Salem, Massachusetts. This item can be shipped to United States.