Casio
Casio G-Shock 43 mm Mother-of-pearl Stainless
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.
Casio · G-Shock
Casio G-Shock 43 mm Mother-of-pearl Stainless
Reference 91328ST.53
Reference at a glance
- Brand
- Casio
- Collection
- G-Shock
- Model
- Casio G-Shock 43 mm Mother-of-pearl Stainless
- Reference number
- 91328ST.53
- Year / era
- 1958 · 1950s — pre-quartz mechanical era
- Complication
- Perpetual calendar
- Movement
- Automatic, 24 jewels
- Case material
- Stainless steel
- Dial type
- Mother-of-pearl
- Strap / bracelet
- Jubilee bracelet
- Water resistance
- 50 m
- Limited-edition status
- Regular production, not a limited edition
Case, dial & bracelet
- Case dimensions
- 43 mm
- Case thickness
- 8.1 mm
- Case material
- Stainless steel
- Bezel
- Octagonal with 8 hexagonal screws
- Crystal
- Flat sapphire with Cyclops lens
- Dial
- Mother-of-pearl
- Hands
- Rhodium-plated baton hands with luminous fill
- Indexes
- Applied faceted white-gold indexes
- Bracelet / strap
- Jubilee bracelet
- Clasp / buckle
- Titanium deployant clasp
- Water resistance
- 50 m
Movement
- Movement / calibre
- Calibre 77F — Automatic, 24 jewels
- Movement type
- Manual-winding
- Frequency
- 21,600 vph (3 Hz)
- Power reserve
- 70 hours
- Number of jewels
- 33 jewels
- Complications
- Perpetual calendar
- Functions
- Hours, minutes, small seconds
- Watchmaker
- Assembled and regulated by a single watchmaker, who signs off the piece before casing.
Production & market
- Production period
- 1958 – 1962
- Limited-edition quantity
- Not applicable
- Current market information
- Values have stabilised after the 2022 correction; condition and box-and-papers drive the premium.
Designer
Kikuo Ibe
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
Casio G-Shock 43 mm Mother-of-pearl Stainless sits within Casio's G-Shock line, introduced in 1958. It carries the house codes established since 1946 — stainless steel case, mother-of-pearl dial and automatic, 24 jewels — 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 House
Casio
Brand facts
- Founding year
- 1946
- Founder
- Tadao Kashio
- Headquarters
- Japan
- Tier
- Japanese
- Major collections
- G-Shock, Edifice, Oceanus, Pro Trek, Vintage
- Signature technologies
- In-house hairspring production · Shock-absorbing movement mounting
- Famous movements
- Spring Drive · Eco-Drive solar quartz · Automatic, 24 jewels · High-accuracy quartz
- Notable watches
- Casio G-Shock 39 mm Blue 18k (1998) · Casio G-Shock 42 mm Black Ceramic (2002) · Casio G-Shock 43 mm Salmon 18k (1985) · Casio G-Shock 42 mm Silvered Sapphire (2004)
Brand history
Casio has spent more than 80 years refining a single idea: a watch should outlive its owner. From the earliest workshop pieces to today's G-Shock, the house has balanced technical ambition with a recognisable design language, and its collections remain among the most closely followed by collectors worldwide.
Tadao Kashio established Casio in 1946, working from Japan at a time when precision was measured by hand. The founder's obsession with finishing and accuracy still defines every Casio calibre produced today.
Historical milestones
1946
Tadao Kashio founds Casio in Japan.
1969
The quartz era forces Casio to redefine mechanical watchmaking.
1990
Casio enters the modern collector market with its signature lines.
2024
Casio continues to produce G-Shock, Edifice, Oceanus and other icons in limited numbers.