Although, at a first glance, the new Arnold & Son DBS (Ref. 1DSAP.W01A.C120P) hand-wound watch seems to be inspired by the gorgeous Jaeger-LeCoultre Duometre family, it is in fact a tribute to a pair of much older timekeepers that were made by John Roger Arnold between 1796 and 1799 respectively. Both watches were able to display mean solar and sidereal time on two separate sub-dials and featured an ingenuous bimetallic thermo-compensated Z balance.
The new A&S1311 hand-wound movement is not only designed and made in-house. The caliber features a very rare design with double barrel/gear train and double balance/escapement running at different speeds in order to properly display mean solar time and mean sidereal time simultaneously.
Since both complications run independently from each other, it is easy to set each indicator using one of two crowns that are placed at 3 and 9 hours. To make the job even easier, A&S designers even equipped the DBS with a 24-hour day/night indicator that features two hands. The one with the star is reserved for the sidereal time display and the other is synchronized with the mean solar time indicator.
Of course, the thin, needle-shaped central seconds hand is reserved for the mean solar time function.
The perfect symmetry of the dial is further emphasized with a pair of balance wheels. Beating at a frequency of 21,600 semi-oscillations per hour, they are visible through a nicely executed cut-out in the silvery-white dial.
Featuring de facto two mechanisms on one main plate (they steel use the same winding system, so the power reserve is quite low at just 40 hours of guaranteed running time), the movement is predictably large at whole 35 millimeters in diameter.
It is however quite thin, even for a hand-wound job, at less than 4 millimeters in height. The case is also quite impressive in its 44 millimeters in diameter, but, thanks to a hair-thin, mirror-polished bezel it doesn’t look massive and will surely look great on a normal wrist.
Photos: Arnold & Son
Arnold & Son DBS Double Balance & Sidereal Time (Ref. 1DSAP.W01A.C120P) Hand-Wound watch specification
Movement: Manual, A&S1311, in-house, 35 mm x 3.9 mm, Swiss Made
Number of jewels: 42
Movement frequency: 21,600 vph
Power reserve: 40 hours
Movement decoration: Rhodium-plated, circular graining and Geneva stripes, decorated by hand
Functions: Hours, minutes, seconds, day/night indication, solar mean time, sidereal time
Case material: Rose gold
Bezel material: Matches case
Crown material: Matches case
Case shape: Round
Bezel shape: Round
Case size: 44.00 mm
Case height: No data
Lug width: No data
Dial: Silvery-white and Silvery-opaline
Numerals: Arabic and Roman
Hour markers: Black
Hands: Rose gold
Water resistance: 30 meters
Strap: Hand-stitched brown alligator leather strap
Crystal: Sapphire, cambered, antireflective on both sides
Case back: Sapphire