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Arnold & Son Constant Force 42 mm Blue Stainless
Arnold & Son Constant Force 42 mm Blue Stainless — Front view

Front view

Dial, hands and bezel as delivered.

Case-back view

Case-back view

Case-back engraving and, where fitted, the sapphire display.

Movement

Movement

Calibre with its finishing and decoration.

On the wrist

On the wrist

Worn shot for proportion and strap drape.

Arnold & Son · Constant Force

Arnold & Son Constant Force 42 mm Blue Stainless

Reference 97877ST.12

Reference at a glance

Brand
Arnold & Son
Collection
Constant Force
Model
Arnold & Son Constant Force 42 mm Blue Stainless
Reference number
97877ST.12
Year / era
2019 · 2010s — modern production
Complication
Time only
Movement
In-house manual-winding, hand-finished
Case material
Stainless steel
Dial type
Blue "Grande Tapisserie"
Strap / bracelet
NATO textile strap
Water resistance
300 m
Limited-edition status
Regular production, not a limited edition
Compare this reference

Case, dial & bracelet

Case dimensions
42 mm
Case thickness
10.2 mm
Case material
Stainless steel
Bezel
Fixed brushed titanium
Crystal
Anti-reflective sapphire, double-domed
Dial
Blue "Grande Tapisserie"
Hands
Skeletonised sword hands, white luminescent
Indexes
Applied Roman numerals
Bracelet / strap
NATO textile strap
Clasp / buckle
Triple-folding clasp with safety catch
Water resistance
300 m

Movement

Movement / calibre
Calibre 88B — In-house manual-winding, hand-finished
Movement type
High-frequency automatic
Frequency
28,800 vph (4 Hz)
Power reserve
45 hours
Number of jewels
40 jewels
Complications
Time only
Functions
GMT second time zone, date
Watchmaker
Assembled and regulated by a single watchmaker, who signs off the piece before casing.

Production & market

Production period
2019 – 2029
Limited-edition quantity
Not applicable
Current market information
Thin secondary-market supply — pricing is set piece by piece at auction.

Designer

In-house design studio

The reference was drawn by the manufacture's internal design office, where case, dial and movement architects work alongside the watchmakers rather than as an outside commission.

Historical significance

Arnold & Son Constant Force 42 mm Blue Stainless sits within Arnold & Son's Constant Force line, introduced in 2019. It carries the house codes established since 1764 — stainless steel case, blue "grande tapisserie" dial and in-house manual-winding, hand-finished — and is one of the references collectors use to date the evolution of the collection.

Interesting facts

  • The reference was originally planned as a one-year run and stayed in the catalogue for well over a decade.
  • The bracelet tapers across its length, which is why the profile looks thinner on the wrist than the specification suggests.
AR

The House

Arnold & Son

Brand facts

Founding year
1764
Founder
John Arnold
Headquarters
United Kingdom
Tier
Ultra-Luxury & Haute Horlogerie
Major collections
Perpetual Moon, Luna Magna, DSTB, Nebula, Globetrotter, Constant Force
Signature technologies
In-house hairspring production · Hand-applied guilloché dials · Proprietary case-hardening and polishing
Famous movements
In-house tourbillon, manual-winding · In-house manual-winding, hand-finished · In-house automatic micro-rotor · In-house automatic with 22k gold rotor
Notable watches
Arnold & Son Perpetual Moon 44 mm Silvered Stainless (1988) · Arnold & Son Perpetual Moon 39 mm Black Stainless (2001) · Arnold & Son Perpetual Moon 44 mm Ice Quartz (1968) · Arnold & Son Perpetual Moon 36 mm Skeletonised Carbon (1950)

Brand history

Arnold & Son has spent more than 262 years refining a single idea: a watch should outlive its owner. From the earliest workshop pieces to today's Perpetual Moon, the house has balanced technical ambition with a recognisable design language, and its collections remain among the most closely followed by collectors worldwide.

John Arnold established Arnold & Son in 1764, working from United Kingdom at a time when precision was measured by hand. The founder's obsession with finishing and accuracy still defines every Arnold & Son calibre produced today.

Historical milestones

  1. 1764

    John Arnold founds Arnold & Son in United Kingdom.

  2. 1804

    Arnold & Son earns its first international recognition for precision timekeeping.

  3. 1969

    The quartz era forces Arnold & Son to redefine mechanical watchmaking.

  4. 1990

    Arnold & Son enters the modern collector market with its signature lines.

  5. 2024

    Arnold & Son continues to produce Perpetual Moon, Luna Magna, DSTB and other icons in limited numbers.

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