

Front view
Dial, hands and bezel as delivered.
Case-back view
Case-back engraving and, where fitted, the sapphire display.
Movement
Calibre with its finishing and decoration.
On the wrist
Worn shot for proportion and strap drape.
Arnold & Son · Luna Magna
Arnold & Son Luna Magna 40 mm Ice Platinum
Reference 27317OR.12
Reference at a glance
- Brand
- Arnold & Son
- Collection
- Luna Magna
- Model
- Arnold & Son Luna Magna 40 mm Ice Platinum
- Reference number
- 27317OR.12
- Year / era
- 1992 · 1990s — mechanical revival
- Complication
- GMT / second time zone
- Movement
- In-house tourbillon, manual-winding
- Case material
- Platinum 950
- Dial type
- Ice blue
- Strap / bracelet
- Alligator leather with folding clasp
- Water resistance
- 50 m
- Limited-edition status
- Regular production, not a limited edition
Case, dial & bracelet
- Case dimensions
- 40 mm
- Case thickness
- 8.8 mm
- Case material
- Platinum 950
- Bezel
- Fixed brushed titanium
- Crystal
- Box sapphire with AR coating
- Dial
- Ice blue
- Hands
- Skeletonised sword hands, white luminescent
- Indexes
- Diamond-set hour markers
- Bracelet / strap
- Alligator leather with folding clasp
- Clasp / buckle
- Folding clasp in matching case metal
- Water resistance
- 50 m
Movement
- Movement / calibre
- Calibre 19F — In-house tourbillon, manual-winding
- Movement type
- Automatic, self-winding
- Frequency
- 21,600 vph (3 Hz)
- Power reserve
- 45 hours
- Number of jewels
- 21 jewels
- Complications
- GMT / second time zone
- Functions
- Hours, minutes, small seconds
- Watchmaker
- The calibre is built in-house and adjusted in five positions before delivery.
Production & market
- Production period
- 1992 – 2008
- Limited-edition quantity
- Not applicable
- Current market information
- Trades close to retail on the secondary market, with steady demand for full-set examples.
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 Luna Magna 40 mm Ice Platinum sits within Arnold & Son's Luna Magna line, introduced in 1992. It carries the house codes established since 1764 — platinum 950 case, ice blue dial and in-house tourbillon, manual-winding — and is one of the references collectors use to date the evolution of the collection.
Interesting facts
- The case is finished by hand, alternating polished and satin-brushed surfaces in a single pass so the edges stay razor sharp.
- Early production dials show a slightly different minute track, and collectors pay a premium for them.
- The reference was originally planned as a one-year run and stayed in the catalogue for well over a decade.
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
1764
John Arnold founds Arnold & Son in United Kingdom.
1804
Arnold & Son earns its first international recognition for precision timekeeping.
1969
The quartz era forces Arnold & Son to redefine mechanical watchmaking.
1990
Arnold & Son enters the modern collector market with its signature lines.
2024
Arnold & Son continues to produce Perpetual Moon, Luna Magna, DSTB and other icons in limited numbers.
More Luna Magna
Arnold & Son Luna Magna 41 mm Skeletonised Quartz
Ref. 58254OR.10
Arnold & Son Luna Magna 40 mm Black Grade
Ref. 67490OR.48
Arnold & Son Luna Magna 38 mm Blue Ceramic
Ref. 11262OR.43
Arnold & Son Luna Magna 37 mm Skeletonised Platinum
Ref. 49503OR.48
Arnold & Son Luna Magna 39 mm Meteorite 18k
Ref. 12334OR.65
