KELHOFF IN MANHEIM, RARE DOUBLE-FACED GOLD WATCH VARIOUS DIALS, CALENDAR, MOON PHASES AUTOMATON AND SPECIAL ESCAPEMENT, PROBABLY 18TH CENTURY Age: circa 18th century Material: red gold, crystal Dimensions: 135 x 40 x 17 mm Case: gold and crystal Movement: double-faced, with dials Escapement: special prototype Weight: 150.5 g Branded: To be serviced: yes Notes: one side slide to be fixed Provenance: Time Museum Rockford Illinois no. 3633 Sptheby's Masterpieces from the Time Museum Part Two NY lot no. 56 19 June 2002 Sotheby's Masterworks of Time: George Daniels, Visionary, London 02 July 2019 KELHOFF A MANHEIM, A RARE AND UNUSUAL GOLD DOUBLE SIDED SARCOPHAGUS FORM ASTRONOMICAL WATCH WITH AUTOMATON AND SPECIAL ESCAPEMENT, LATE 18TH CENTURY