A very fine and rare, first quality, engine-turned, silver-cased pocket barometer altimeter by L Casella, London, No 594, c1863, case by William Smiley - £685

An important, very early, fine, silver-cased pocket barometer by Negretti & Zambra, London, No 575, hallmarked for 1863

A fine antique first quality English silver-cased pocket barometer altimeter by J Hicks, London, No 7702, case by Albert Thomas Oliver, c1905 - £625

An unusual antique silver watch-cased pocket barometer by Short & Mason, No 14, with case by Albert Thomas Oliver, retailed by Kilpatrick & Co, London & Melbourne, c1910 - £650

A fine antique silver pocket barometer and altimeter by J Hicks, No 10065, with case by Albert Thomas Oliver, c1912 - £600

An exceptional Royal presentation silver pocket barometer compendium by Alfred Clark, London, with movement by Short & Mason, c1900 - £2750

A very good commemorative silver-cased aneroid pocket altimeter barometer by J. Hicks, No 8166, c1906, with case by Albert Thomas Oliver, to 20000ft - £625