An 18ct gold open-face pocket watch by Edouard Koehn for Tiffany & Co. The white enamel dial with

An 18ct gold open-face pocket watch by Edouard Koehn for Tiffany & Co. The white enamel dial with Arabic numerals denoting hours, subsidiary seconds dial and inscribed Tiffany & Co. Switzerland, the keyless 7 adjustment, 20 jewel movement numbered ‘83257’ and stamped ‘Made for Tiffany by Ed Koehn Switzerland’, 18ct gold dust cover with inscription dated 1911 and case-back engraved with initials ‘FMJ’, 45mm case diameter, gross weight approximately 65.4g