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Arnold & Son HM Double Hemisphere Perpetual Moon (Royal Collection) Technical details Model: HM Double Hemisphere Perpetual Moon Reference: 1GLAR.U03A.C122A, 18-karat red gold case, blue guilloché dial Movement: ? Calibre: A&S1512 ? Manufacture Arnold & Son calibre, hand-wound, big perpetual moons, 27 jewels, diameter 34 mm, thickness ? 5.35 mm ? Power reserve 90 h ? Two barrels, 21'600 vibrations/h Movement decoration: nickel-silver movement, rhodium treated with Haute Horlogerie finishing: manually chamfered bridges with polished edges, fine circular graining and Côtes de Gen?ve rayonnantes, blued screws Dial: ? Translucent blue lacquered guilloché ? Translucent blue lacquered guilloché moon disc with golden moon and stars Back dial: ? Fine circular graining, rhodium treated, rendition of the 8 phases of the moon Functions: Hours, minutes, two big perpetual moon phase indications on the front, diameter disc: 29 mm, diameter moons: 11.20 mm, third moon phase indication on the back for setting purposes Case: ? 18-karat red gold ? Diameter 42 mm ? Cambered sapphire with antireflective coating on both sides ? Case back see-through sapphire ? Water-resistant to 30 m Strap: ? Hand-stitched black or brown alligator leather zdroj - http://www.masterhorologer.com/2016/02/arnold-son-hm-double-hemisphere.html
