Franck Muller, America's GMT, 18k Gold, Enamel Dial, Ref. 5850 WW, circa 1990's Case: 32 mm x 45 mm, 18k gold, two body, tonneau, solid back secured with screws, No. 17 Dial: blue guilloche enamel with golden Arabic numerals, cloisonne polychrome enameled map of North and South America, gold spade hands, serpentine pointer for the second time zone Movement: FM caliber 2800, rhodium finish, automatic, platinum trim rotor, lever escapement, monometallic balance, shock absorber, 21 jewels Band: Franck Muller leather band and 18k gold buckle Signed: Franck Muller on the dial, case, movement, and band HID03101062020 © 2020 Heritage Auctions | All Rights Reserved