Quarter-hour Repeater Perpetual Calendar Open-face Chronograph Watch and a Sterling Silver Perpetual Calendar Watch

Quarter-hour Repeater Perpetual Calendar Open-face Chronograph Watch and a Sterling Silver Perpetual Calendar Watch, porcelain arabic numeral dial with outer minute track, day-of-the-month subsidiary dial at 12, constant seconds and phase of the moon at 6, day of the week and month apertures, blued-steel Breguet-style hands, chronograph pusher at 2 and repeater pusher at 6, stem-wind, pin-set unmarked movement, housed in a gold-filled screw-back case, 57 mm; the sterling silver example marked "J.H. Hasler/Switzerland" on case and movement, dia. 50 mm.