Blancpain Lady B Celebrates 70 Years Of Ladybird With A Mechanical Jewel

Inspired by the 1956 Ladybird Bullet, the 19mm Lady B continues Blancpain’s tradition of mechanical miniaturization in a spherical form.

Seventy years after the creation of the Ladybird collection, Blancpain returns to one of the most distinctive chapters in its history with the Lady B. The new timepiece takes its inspiration from the Ladybird Bullet, introduced in 1956 under the leadership of Betty Fiechter, and translates its philosophy of mechanical miniaturization into a contemporary object designed to be worn almost like a piece of jewellery.

The Ladybird Bullet was the first watch in the Ladybird collection and represented a remarkable achievement for its time. Its R52/R55 calibre measured just 11.85mm in diameter, making it the world’s smallest round mechanical movement ever mass-produced. Blancpain’s new Lady B continues that legacy with the Manufacture Calibre 615, one of the smallest contemporary automatic mechanical movements with a round architecture.

Yet the Lady B is deliberately not a reissue. Rather than reproducing the lines of the 1956 watch, Blancpain took the original idea — placing fine mechanical watchmaking inside an object small enough to resemble a jewel — and developed an entirely new architecture around it.

B As In Bubble

The most immediate characteristic of the Lady B is its spherical case. Measuring only 19mm in diameter and 13.2mm in thickness, the watch has a volume of just 2.9cm³, shifting the emphasis away from conventional dimensions and towards the three-dimensional form of the object.

The spherical architecture was developed around the Calibre 615 from the beginning. The case, sapphire crystal, polished rehaut, integrated strap passage and water resistance were all engineered together to accommodate the movement within such a compact volume.

There are no conventional lugs. Instead, the strap passes directly through an opening machined into the solid metal case, creating an uninterrupted transition between the spherical body and the double-tour strap. The result is closer to a small sculptural object than a conventional round watch.

The Art Of Making Something This Small

Despite its apparent simplicity, the Lady B’s case is technically demanding. Blancpain required more than thirty technical drawings to develop the tiny 2.9cm³ sphere, which is constructed from separate upper and lower sections.

The challenge was not simply making the components smaller, but making the construction appear almost seamless. The junction between the bezel and case back is deliberately concealed through the interaction of volume, light and polishing, giving the impression of a single continuous piece of metal.

The case is finished by hand in polished, satin-finished and micro-blasted surfaces. Even the engravings are mechanically cut rather than relying exclusively on laser engraving. At this scale, the smallest finishing detail becomes part of the overall character of the watch.

The strap passage presents another technical challenge. Measuring just 10 × 1.6mm, the opening is machined directly into the case. Its interior is micro-blasted so that the leather can pass smoothly, while the edges and knurling are finished by hand using traditional cabochon tools.

A Dial Designed To Disappear

The Lady B’s dial follows the same philosophy of restraint. Both the stainless-steel and 18K red-gold versions feature a warm beige opaline dial created through gold inlay, without gem-setting or unnecessary decoration.

Applied gold stick indices measure just 1.82 × 0.39mm and are polished on their upper surfaces and sides to capture the light subtly. The polished rehaut acts almost like a mirror, extending the curves of the spherical case and reinforcing the impression that the watch has been carved from a single volume.

There is very little on the dial itself: hours, minutes and the discreet Blancpain logo. Even the crown carries a historical reference, with the initials “JB” recalling Blancpain’s heritage.

The Mechanical Heart Of Lady B

At the centre of the Lady B is Blancpain’s Manufacture Calibre 615. Introduced in 1995 and continuously refined over the years, the automatic movement measures 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 provides a 38-hour power reserve. The movement features Côtes de Genève decoration and a silicon balance spring, reflecting the technical evolution that the calibre has undergone since its introduction.

The geometry of the case back was specifically developed around the trajectory of the movement’s rotor, demonstrating how the watch was designed as a complete system rather than as a small case simply built around an existing calibre.

From Betty Fiechter To Lady B

The Lady B also carries the legacy of Betty Fiechter, one of the most important figures in Blancpain’s history. She entered Blancpain’s workshop in Villeret as a 16-year-old apprentice in 1912 and eventually became co-owner of the Manufacture in 1933.

After the death of her business partner André Leal on the eve of the Second World War, Fiechter found herself leading the company alone. At a time when Swiss women did not yet have the right to vote, she became the first woman to own and lead a Swiss watch Manufacture, overseeing more than 200 employees.

Her understanding of women’s watches was particularly significant. Fiechter believed that feminine timepieces deserved the same mechanical ingenuity and integrity as other watches, helping establish this area as an important part of Blancpain’s identity.

Together with her nephew Jean-Jacques Fiechter, she helped shape two watches that would become fundamental to the brand: the Fifty Fathoms in 1953 and the Ladybird in 1956.

Worn Like A Jewel

The Lady B is available in polished stainless steel or 18K red gold and is not a limited edition. Both versions share the same 19mm spherical architecture and warm beige opaline dial, allowing the material of the case to provide the main visual distinction.

Each watch comes with a double-tour calf leather strap available in seven colours: white, beige, mocha, burgundy, blue, coral and purple. The strap passes through the case itself and wraps around the wrist, reinforcing Blancpain’s intention for the Lady B to sit somewhere between watch and jewel.

The strap can also be changed easily, as it fits into a dedicated slot on the back of the watch. It is an unusually intimate approach to a mechanical timepiece, designed around the idea that a watch this small can become part of the jewellery worn on the wrist.

Available from September 17, 2026, the Blancpain Lady B starts at CHF 9,500 in stainless steel and CHF 14,500 in 18K red gold. More than simply marking 70 years of Ladybird, it continues the philosophy established in 1956: proving that mechanical watchmaking does not need a large canvas to demonstrate technical ingenuity.

Technical Specifications

For more information, please visit the official Blancpain website.

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