White gold Watch no. ???

Case: Dial: Movement: Provenance: 19?? - Touchon, Geneve 2011 - Sotheby's, 13 Apr 2011, est $4-6000, sold $4,375, "AN 18K WHITE GOLD OPEN-FACED JUMP HOUR WATCH CIRCA 1920 18k white gold • movement marked Extra, 19 jewels • silvered dial, Arabic minutes tracking, aperture for jump hour, subsidiary seconds • coin-edge band and pendant, monogram to case back • case, dial and movement signed " 2014 - Sotheby's, 7 Apr 2014, est HKD32-48,000, sold HKD40,000, " A WHITE GOLD OPEN-FACED JUMP HOUR WATCH CIRCA 1920 18k white gold • manual winding nickel lever movement marked Extra, bi-metallic compensation balance, 19 jewels • silvered dial, Arabic minutes tracking, aperture for jump hour, subsidiary seconds • 18k white gold case, coin-edge band and pendant, monogram to case back • case, dial and movement signed "