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.
MB&F · LM Perpetual
MB&F LM Perpetual 37 mm Skeletonised Sapphire
Reference 76242OR.55
Reference at a glance
- Brand
- MB&F
- Collection
- LM Perpetual
- Model
- MB&F LM Perpetual 37 mm Skeletonised Sapphire
- Reference number
- 76242OR.55
- Year / era
- 2005 · 2000s — modern production
- Complication
- Minute repeater
- Movement
- In-house automatic with 22k gold rotor
- Case material
- Sapphire crystal case
- Dial type
- Skeletonised
- Strap / bracelet
- White rubber velcro strap
- Water resistance
- 150 m
- Limited-edition status
- Regular production, not a limited edition
Case, dial & bracelet
- Case dimensions
- 37 mm
- Case thickness
- 14.1 mm
- Case material
- Sapphire crystal case
- Bezel
- Baguette diamond rainbow
- Crystal
- Anti-reflective sapphire, double-domed
- Dial
- Skeletonised
- Hands
- Rhodium-plated baton hands with luminous fill
- Indexes
- Applied Roman numerals
- Bracelet / strap
- White rubber velcro strap
- Clasp / buckle
- Pin buckle in matching case metal
- Water resistance
- 150 m
Movement
- Movement / calibre
- Calibre 69A — In-house automatic with 22k gold rotor
- Movement type
- Automatic, self-winding
- Frequency
- 36,000 vph (5 Hz)
- Power reserve
- 70 hours
- Number of jewels
- 25 jewels
- Complications
- Minute repeater
- Functions
- Chronograph, tachymeter, date
- Watchmaker
- Assembled and regulated by a single watchmaker, who signs off the piece before casing.
Production & market
- Production period
- 2005 – 2020
- Limited-edition quantity
- Not applicable
- Current market information
- Trades close to retail on the secondary market, with steady demand for full-set examples.
Designer
Gérald Genta
Gérald Genta (1931–2011) trained as a goldsmith in Geneva and became the most influential watch designer of the 20th century. Working freelance, he sketched the Audemars Piguet Royal Oak overnight in 1970, followed by the Patek Philippe Nautilus, the IWC Ingenieur SL and the Bulgari Bulgari — defining the integrated-bracelet luxury sports watch as a category.
Historical significance
MB&F LM Perpetual 37 mm Skeletonised Sapphire sits within MB&F's LM Perpetual line, introduced in 2005. It carries the house codes established since 2005 — sapphire crystal case case, skeletonised dial and in-house automatic with 22k gold rotor — 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
MB&F
Brand facts
- Founding year
- 2005
- Founder
- Maximilian Büsser
- Headquarters
- Switzerland
- Tier
- Ultra-Luxury & Haute Horlogerie
- Major collections
- Horological Machine, Legacy Machine, LMX, LM Perpetual, HM11
- Signature technologies
- Composite and ceramic case materials · Anti-magnetic silicon escapement · Shock-absorbing movement mounting
- Famous movements
- In-house tourbillon, manual-winding · In-house automatic micro-rotor · In-house manual-winding, hand-finished · In-house automatic with 22k gold rotor
- Notable watches
- MB&F Horological Machine 42 mm Blue 18k · MB&F Horological Machine 43 mm Ice Quartz · MB&F Horological Machine 40 mm Skeletonised 18k · MB&F Horological Machine 38 mm Salmon Ceramic
Brand history
MB&F has spent more than 21 years refining a single idea: a watch should outlive its owner. From the earliest workshop pieces to today's Horological Machine, the house has balanced technical ambition with a recognisable design language, and its collections remain among the most closely followed by collectors worldwide.
Maximilian Büsser established MB&F in 2005, working from Switzerland at a time when precision was measured by hand. The founder's obsession with finishing and accuracy still defines every MB&F calibre produced today.
Historical milestones
2005
Maximilian Büsser founds MB&F in Switzerland.
2024
MB&F continues to produce Horological Machine, Legacy Machine, LMX and other icons in limited numbers.