What happens when 70 years of watchmaking history is condensed into a 19mm mechanical jewel?

Blancpain answers with the Lady B, a distinctly contemporary interpretation of the idea that gave birth to the Ladybird collection in 1956.

Created under the leadership of Betty Fiechter, the first woman to lead a Swiss watch manufacture, the original Ladybird Bullet was built around an extraordinary ambition: create a remarkably small yet robust mechanical movement. Its R52/R55 calibre measured just 11.85mm in diameter and became the world’s smallest round mechanical movement produced in series, according to Blancpain’s historical account.

Seven decades later, Blancpain isn’t simply bringing that watch back.

It is rethinking the idea behind it.

From Ladybird Bullet to Lady B

The new Blancpain Lady B is explicitly described as a contemporary reinterpretation rather than a reissue of the 1956 Ladybird Bullet. Its design takes the original watch’s philosophy of miniaturisation and translates it into an entirely new architecture.

Its most immediately striking feature is its spherical case.

Measuring only 19mm in diameter, the case has a thickness of 13.20mm and a volume of just 2.9cm³. Rather than treating the watch as a flat object defined primarily by its diameter, Blancpain conceived Lady B in three dimensions.

The result is closer to a polished mechanical pebble or jewel than a conventional round wristwatch.

And that is precisely the point.

A Mechanical Heart in a Tiny Space

Inside the spherical case is Blancpain’s Manufacture Calibre 615, an automatic movement measuring 15.70mm in diameter and 3.90mm thick.

It contains 180 components and 29 rubies, operates at 3Hz, or 21,600 vibrations per hour, and delivers a 38-hour power reserve. Its plates are finished with Côtes de Genève, while a silicon balance spring is part of its evolution.

The movement’s compact architecture wasn’t simply placed inside an existing case.

The entire watch was developed around it.

Blancpain says the spherical case, sapphire crystal, polished rehaut, integrated strap passage and water resistance were developed in parallel to accommodate Calibre 615.

That makes the Lady B’s small dimensions more than an aesthetic exercise. They are the consequence of designing the watch around its mechanical core.

No Lugs. No Conventional Case Architecture.

Perhaps the most unusual aspect of Lady B is what it leaves out.

There are no traditional lugs.

Instead, the calf leather strap passes directly through an opening machined into the case. The passage measures just 10 × 1.6mm, and Blancpain describes the interior as micro-blasted so the leather can glide through it. The edges and knurling are finished by hand.

This creates a continuous visual relationship between the spherical case and the strap.

The watch doesn’t look as though a strap has been attached to it.

The strap appears to emerge from it.

Minimalism Is Doing the Heavy Lifting

The dial takes an equally restrained approach.

The warm beige opaline dial is identical across the stainless-steel and 18K red-gold versions. There is no gem-setting, allowing the dial surface, gold indices and reflections from the polished rehaut to define the visual character.

The applied stick indices are made from gold and measure only 1.82 × 0.39mm.

The hands remain deliberately simple, displaying only the hours and minutes.

This restraint is important because the case is already doing most of the visual talking. The polished spherical architecture creates changing reflections across its surface, while the clean dial prevents the watch from becoming visually busy.

Seven Straps, One Tiny Wrist Presence

The Lady B arrives on a double-tour calf leather strap, reinforcing its jewellery-like character.

There are seven colour options:

• White
• Beige
• Mocha
• Burgundy
• Blue
• Coral
• Purple

The strap fits through the rear of the watch and can be changed easily.

The double-tour construction also changes how the 19mm case sits visually on the wrist. Instead of functioning simply as a tiny watch, the strap becomes an integral part of the design language.

Betty Fiechter: The Woman Behind the Original Vision

The Lady B story becomes considerably more interesting when you look back at Betty Fiechter.

Fiechter entered Blancpain’s workshop in Villeret as a 16-year-old apprentice in 1912. By 1933, she had become co-owner of the Manufacture, and she ultimately became the first woman to own and lead a Swiss watch manufacture.

Her contribution wasn’t limited to keeping the company operating through difficult economic and historical circumstances.

She also recognised the importance of mechanical watches for women.

Blancpain’s historical account notes that Fiechter believed women’s watches deserved the same ingenuity and mechanical integrity as other timepieces, making this area one of Blancpain’s defining strengths.

In 1956, the Ladybird emerged from this philosophy.

The Lady B now connects that history to Blancpain’s contemporary approach to mechanical miniaturisation.

The 1956 Technical Miracle

The original Ladybird Bullet’s R52/R55 calibre was only 11.85mm in diameter.

Its compact architecture incorporated a fifth wheel into the gear train and shock protection for the balance, allowing Blancpain to pursue extreme miniaturisation without abandoning robustness. The movement contained 133 individually machined components and operated at 3Hz.

The movement’s influence extended beyond Blancpain, with the press release noting that houses including Omega and Longines subsequently adopted it for their own creations. Its tiny footprint also enabled a wide variety of jewellery watches, bracelets, bangles, rings and pendants.

That history explains why the Ladybird is more than simply an old model in Blancpain’s archive.

Miniaturisation became a creative platform.

Lady B continues that idea in a radically different form.

Stainless Steel or 18K Red Gold?

Blancpain offers the Lady B in two case materials:

Stainless Steel

• 19mm diameter
• 13.20mm thickness
• 30m water resistance
• CHF 9,500

18K Red Gold

• 19mm diameter
• 13.20mm thickness
• 30m water resistance
• CHF 14,500

The watch is not a limited edition and is available through Blancpain boutiques and authorised retailers from 17 September 2026.

A New Chapter, Rather Than a Reissue

The Blancpain Lady B succeeds by resisting the obvious route.

It doesn’t attempt to reproduce the Ladybird Bullet line for line. Instead, it takes the central idea behind that watch, mechanical watchmaking on an extraordinarily small scale, and pushes it into a new design language.

A spherical 19mm case.

A tiny automatic movement.

An integrated double-tour strap.

A deliberately quiet opaline dial.

And a direct connection to Betty Fiechter and the Ladybird’s history.

Seventy years after the Ladybird first appeared, Blancpain’s smallest statement may also be one of its most conceptually interesting.

The Lady B is tiny in dimensions.

Its mechanical ambition is anything but.