A Lange Sohne Zeitwerk White Gold 41.9mm Black Dial 140.029

The A. Lange & Söhne Zeitwerk is one of the most consequential watch introductions of the twenty-first century — a timepiece that reimagined how a mechanical watch could display time. Rather than sweeping hands, the Zeitwerk presents the hours and minutes through three large jumping numeral discs arranged in a linear window across the dial, each snapping instantaneously to the next value at the precise moment of the time change. This is not a digital aesthetic borrowed from electronics but a purely mechanical achievement, requiring a constant-force mechanism to ensure the discs jump with uniform energy regardless of mainspring tension. Reference 140.029 is the white gold expression of this landmark design, bringing the movement's architectural drama to one of horology's most precious case metals.

The 41.9mm white gold case of reference 140.029 is a substantial yet refined presence on the wrist. White gold lends the Zeitwerk an icy, platinum-like austerity that complements the black dial beautifully, creating a high-contrast composition that is both legible and visually arresting. The white gold bezel frames the dial with clean, beveled lines characteristic of the Glashütte finishing tradition, while the sapphire crystal above and caseback below allow the wearer to appreciate the watch from every angle. The proportions — just under 42mm across — give the Zeitwerk the wrist authority its bold display demands without crossing into oversized territory.

The black index dial of the 140.029 is the stage upon which Lange's mechanical theater plays out. Three large apertures — two for the minutes digits and one for the hours — dominate the upper portion of the dial, while a small running seconds subdial occupies the lower half, a detail that underscores the fully mechanical nature of the movement. The indices are rendered with the precision and restraint that define Lange's design language: no excess, no decoration for its own sake, only form in service of legibility. The contrast between the warm glow of white gold text and hardware against the deep black ground gives this reference an almost cinematic quality under any light.

Powering the Zeitwerk is a hand-wound mechanical movement of exceptional complexity. The constant-force escapement — one of Lange's most celebrated engineering achievements — ensures that the jumping disc mechanism receives a uniform impulse at every tick, delivering accuracy and consistency that conventional lever escapements cannot match when tasked with snapping large discs. The movement is finished to Lange's exacting standards: hand-engraved balance cock, three-quarter plate in German silver, and blued screws throughout. Viewing the movement through the sapphire caseback reveals a landscape of finishing that rivals fine jewellery in its precision and artistry.

On the wrist, the Zeitwerk 140.029 communicates something rare: genuine intellectual ambition translated into daily wearable form. Paired with the supple leather strap, the white gold case sits comfortably and securely, the strap's texture offering a counterpoint to the metal's cool luminosity. This is not a watch for those seeking an anonymous dress piece — it is for the collector who wants conversation, who values horology's capacity for mechanical poetry, and who appreciates that Lange produces each watch in strictly limited numbers from its manufactory in Glashütte, Saxony.

Bizak & Co. is pleased to offer this brand-new A. Lange & Söhne Zeitwerk reference 140.029 complete with its original box and papers. Buying from Bizak means working with a trusted luxury watch dealer committed to authenticity, competitive pricing, and white-glove service. Whether you are adding a cornerstone piece to a serious collection or acquiring your first Lange, our team is ready to guide you through the purchase. Contact us online at bizakandco.com or reach out directly — we welcome the opportunity to place this extraordinary timepiece on your wrist.