Grand Seiko
Grand Seiko Masterpiece 37 mm Green Sapphire
Photography on request
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.
Grand Seiko · Masterpiece
Grand Seiko Masterpiece 37 mm Green Sapphire
Reference 54446OR.87
Reference at a glance
- Brand
- Grand Seiko
- Collection
- Masterpiece
- Model
- Grand Seiko Masterpiece 37 mm Green Sapphire
- Reference number
- 54446OR.87
- Year / era
- 2014 · 2010s — modern production
- Complication
- Annual calendar
- Movement
- Automatic chronograph
- Case material
- Sapphire crystal case
- Dial type
- Green sunburst
- Strap / bracelet
- Jubilee bracelet
- Water resistance
- 500 m
- Limited-edition status
- Regular production, not a limited edition
Case, dial & bracelet
- Case dimensions
- 37 mm
- Case thickness
- 8.8 mm
- Case material
- Sapphire crystal case
- Bezel
- Bidirectional 24-hour Cerachrom
- Crystal
- Box sapphire with AR coating
- Dial
- Green sunburst
- Hands
- Mercedes hour hand with Chromalight display
- Indexes
- Printed minute track with applied batons
- Bracelet / strap
- Jubilee bracelet
- Clasp / buckle
- Folding clasp in matching case metal
- Water resistance
- 500 m
Movement
- Movement / calibre
- Calibre 83D — Automatic chronograph
- Movement type
- Automatic with micro-rotor
- Frequency
- 25,200 vph (3.5 Hz)
- Power reserve
- 10 days
- Number of jewels
- 37 jewels
- Complications
- Annual calendar
- Functions
- Dive time, running seconds
- Watchmaker
- Finishing, assembly and timing are carried out in the manufacture's own atelier.
Production & market
- Production period
- 2014 – 2022
- Limited-edition quantity
- Not applicable
- Current market information
- Values have stabilised after the 2022 correction; condition and box-and-papers drive the premium.
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
Grand Seiko Masterpiece 37 mm Green Sapphire sits within Grand Seiko's Masterpiece line, introduced in 2014. It carries the house codes established since 1960 — sapphire crystal case case, green sunburst dial and automatic chronograph — and is one of the references collectors use to date the evolution of the collection.
Interesting facts
- Early production dials show a slightly different minute track, and collectors pay a premium for them.
- The bracelet tapers across its length, which is why the profile looks thinner on the wrist than the specification suggests.
The House
Grand Seiko
Brand facts
- Founding year
- 1960
- Founder
- Seiko / Daini & Suwa Seikosha
- Headquarters
- Japan
- Tier
- Premium
- Major collections
- Heritage, Evolution 9, Elegance, Sport, Masterpiece, Spring Drive
- Signature technologies
- Proprietary case-hardening and polishing · Certified chronometer regulation
- Famous movements
- High-beat automatic · Spring Drive · Automatic, Swiss lever escapement · Automatic chronograph
- Notable watches
- Grand Seiko Heritage 37 mm Ice Platinum (1960) · Grand Seiko Heritage 42 mm Black Stainless (1963) · Grand Seiko Heritage 37 mm Slate Ceramic (1969) · Grand Seiko Heritage 44 mm Skeletonised Ceramic (1975)
Brand history
Grand Seiko has spent more than 66 years refining a single idea: a watch should outlive its owner. From the earliest workshop pieces to today's Heritage, the house has balanced technical ambition with a recognisable design language, and its collections remain among the most closely followed by collectors worldwide.
Seiko / Daini & Suwa Seikosha established Grand Seiko in 1960, working from Japan at a time when precision was measured by hand. The founder's obsession with finishing and accuracy still defines every Grand Seiko calibre produced today.
Historical milestones
1960
Seiko / Daini & Suwa Seikosha founds Grand Seiko in Japan.
1969
The quartz era forces Grand Seiko to redefine mechanical watchmaking.
1990
Grand Seiko enters the modern collector market with its signature lines.
2024
Grand Seiko continues to produce Heritage, Evolution 9, Elegance and other icons in limited numbers.