Important Modern & Vintage Timepieces

Hong Kong, May 10, 2020

LOT 169

Arnold & Son - Ref. 1DGAS.S01A.C121S, double barrel and escapement, Two-time zone, GMT 24-hour indication; “Instrument”, “DBG Equation GMT”; numbered edition; stainless steel

HKD 40,000 - 50,000

USD 5,200 - 6,500 / EUR 4,800 - 6,000 / CHF 5,200 - 6,500

Sold: HKD 62,500

Stainless steel, manual-winding, round-shaped, large gentleman’s wristwatch, water-resistant with sapphire-crystal case-back screwed by six screws, light-grey and silver opaline colour dial with radial Roman and Arabic numerals, centre-seconds with two horological complications: • Two separate time displays, each driven by its own barrel and gear train with its own escapement and balance • Equation of the two time zones on a 24-hour basis (subsidiary dial at 12 o’clock).

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Image Image

Grading System
Grade: AAA


Case: 1

As new

Movement: 1 *
Dial: 1-01

As new

HANDS Original

Brand Arnold & Son, London and La Chaux-de-Fonds

Model “Instrument”, “DBG Equation GMT”

Reference 1DGAS.S01A.C121S

Year circa 2015

Movement No. unnumbered

Case No.

Material stainless steel

Bracelet black crocodile leather A&S strap

Buckle stainless steel A&S buckle

Diameter 44 mm.

Caliber A&S 1209, two barrels, adjusted to five positions (40 hours)

Signature dial, case and movement

Accessories original fitted box, certificate or origin, instruction booklet


Arnold & Son, “Instrument”, “DBG Equation GMT”

Watches with a double barrel and escapement have a tradition going back many years in horology but are rarely found today. The principle is ideally suited to the Arnold & Son’s “Instrument” line because a separate barrel / gear train and balance / escapement enable the watch to house different complications without having one influencing the accuracy of the other by draining its energy. It is therefore perfectly adapted to be used for a second time zone, as in the “DBG Equation GMT”.

Another practical advantage of having a double barrel / gear train and a double balance / escapement is the fact that it allows to house two completely different technical solutions and characteristics for each complication in one and the same movement. The Instrument DBS, for example, which is also being unveiled in 2012, not only shows mean solar time but also boasts a separate display for sidereal, or star, time using a specific gear train with a different / higher rotation speed than the one of the mean solar time indication.