Arnold & Son Unveils the World’s First True Beat Seconds and Chronograph Wristwatch: the Instrument CTB.
The CTB joins Arnold & Son’s Instrument Collection – and, like every other model from Arnold & Son, features an in-house mechanical movement. This line is inspired by the timepieces produced during the second part of John Arnold’s life when he and his son, John Roger, dedicated themselves to the quest for absolute precision (thereby establishing themselves as official suppliers to the Royal Navy).
The A&S7103 calibre is a proprietary mechanical self-winding movement with column-wheel operated chronograph. The movement is configured to give optimum balance and beauty to the dial, with off-centered hour and minutes at 12 o’clock, big central true beat seconds and central chronographs seconds, and 60-minutes chronograph indicator at 6 o’clock. The 31-jewel movement beats at 28,800 vibrations per hour and offers more than 50 hours of power reserve. This world’s-first timepiece also offers the efficiency of bi-directional winding thanks to ceramic ball bearings.
Main technical characteristics:
Calibre: A&S7103
Exclusive Arnold & Son mechanical movement, self-winding, column- wheel, ceramic ball bearing, 31 jewels, diameter 30.4 mm, thickness 8.5 mm, power reserve 50 h (without chronograph), 28,800 vibrations/h
Functions: hours, minutes, true beat seconds, chronograph
Movement decoration: NAC grey treated with Haute Horlogerie finishing: hand-chamfered bridges and polished edges, fine circular graining and Côtes de Genève rayonnantes, circular satin-finished wheels, screws with bevelled and mirror-polished heads. Oscillating weight: skeletonised with brushed surfaces
Dial: light-grey and silvery opaline
Case: Stainless steel, diameter 44 mm, cambered sapphire with anti-reflective coating on both sides, see-through sapphire case back, water-resistant to 30 m
Strap: Hand-stitched black or brown alligator leather
Reference: 1CHAS.S02A.C121S
