Minase
Minase Five Windows 43 mm Mother-of-pearl 18k
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.
Minase · Five Windows
Minase Five Windows 43 mm Mother-of-pearl 18k
Reference 91384OR.11
Reference at a glance
- Brand
- Minase
- Collection
- Five Windows
- Model
- Minase Five Windows 43 mm Mother-of-pearl 18k
- Reference number
- 91384OR.11
- Year / era
- 2020 · 2020s — modern production
- Complication
- Tourbillon
- Movement
- Spring Drive
- Case material
- 18k rose gold
- Dial type
- Mother-of-pearl
- Strap / bracelet
- Jubilee bracelet
- Water resistance
- 300 m
- Limited-edition status
- Regular production, not a limited edition
Case, dial & bracelet
- Case dimensions
- 43 mm
- Case thickness
- 11.3 mm
- Case material
- 18k rose gold
- Bezel
- Bidirectional 24-hour Cerachrom
- Crystal
- Flat sapphire with Cyclops lens
- Dial
- Mother-of-pearl
- Hands
- Skeletonised sword hands, white luminescent
- Indexes
- Diamond-set hour markers
- Bracelet / strap
- Jubilee bracelet
- Clasp / buckle
- Folding clasp in matching case metal
- Water resistance
- 300 m
Movement
- Movement / calibre
- Calibre 77D — Spring Drive
- Movement type
- Automatic with micro-rotor
- Frequency
- 25,200 vph (3.5 Hz)
- Power reserve
- 5 days
- Number of jewels
- 25 jewels
- Complications
- Tourbillon
- 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
- 2020 – 2032
- 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
Minase Five Windows 43 mm Mother-of-pearl 18k sits within Minase's Five Windows line, introduced in 2020. It carries the house codes established since 2005 — 18k rose gold case, mother-of-pearl dial and spring drive — 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 movement's bridges are decorated even where they will never be seen once the watch is cased.
The House
Minase
Brand facts
- Founding year
- 2005
- Founder
- Kyowa Co. / Susumu Kitamura
- Headquarters
- Japan
- Tier
- Japanese
- Major collections
- Divido, Five Windows, Horizon, Masterpiece
- Signature technologies
- In-house hairspring production · Proprietary case-hardening and polishing
- Famous movements
- Automatic, 24 jewels · Eco-Drive solar quartz · High-accuracy quartz · Spring Drive
- Notable watches
- Minase Divido (2000) · Minase Horizon (2001) · Minase Uruga (2002)
Brand history
Minase has spent more than 21 years refining a single idea: a watch should outlive its owner. From the earliest workshop pieces to today's Divido, the house has balanced technical ambition with a recognisable design language, and its collections remain among the most closely followed by collectors worldwide.
Kyowa Co. / Susumu Kitamura established Minase in 2005, working from Japan at a time when precision was measured by hand. The founder's obsession with finishing and accuracy still defines every Minase calibre produced today.
Historical milestones
2005
Kyowa Co. / Susumu Kitamura founds Minase in Japan.
2024
Minase continues to produce Divido, Five Windows, Horizon and other icons in limited numbers.