The watch runs nonstop for eight full days thanks to the exceptional operating regularity of its Eterna Spherodrive.
Press release

The "Madison Eight-Days" © ETERNA
Oversized date and power reserve indication in a stylish design
Along with the understated elegance of its stainless steel case with its discreet lateral decoration, water-resistant to 30 metres (~ 100 feet, 3 bars), the originality of the Madison Eight- Days' dial layout makes it an eminently suitable companion for today's busy travellers. It provides an attractive choice of silvered, grey or black dial faces with centre cobbled texture and sunray-pattern surround, enhanced with rhodium-plated or gold-coloured baton hour makers and seconds hand while the hour and minute hands are coated with a luminous compound. Both the oversized date calendar at 2 o'clock on the dial and the power-reserve indicator between 7 and 8 o'clock occupy original, particularly practical positions. A scratch-resistant and antireflective crystal completes this unusual dial face. Secured by four screws, the case back features a sapphire crystal porthole revealing the movement's intricate workings. The Madison Eight-Days comes with a brown, grey or black Louisiana alligator strap, coordinated with the dial hue.Eterna calibre 3510 – extended and smooth operation
Mounted on ball bearings in Eterna Spherodrive fashion, this proprietary Eterna movement's two series-coupled barrels provide the hour, minute and seconds hands with eight full days of exceptionally smooth and regular operation. This extended period is of course also recorded on its oversized date calendar and the power-reserve indicator with 192-hour graduations. What's more, to protect the movement's highly precise rate, calibre 3510 includes an automatic cut-off of the balance wheel after eight days' continuous operation. Equally practical, the fast-acting date corrector, usable without restriction 24 hours a day and positioned at 10 o'clock on the case flank, is ideal for travellers regularly crisscrossing time-zone lines. Providing 192 hours of power reserve, the hand-wound calibre 3510 with Eterna Spherodrive, 14 3/4 x 12 lines, 28,800 v.p.h., features 7 ball bearings, 22 jewels and a Glucydur balance wheel. Fitted with the Eterna calibre 3510 movement, the Madison Eight-Days embodies to perfection the spirit of the Eterna brand, fostered by over 150 years of pioneering achievements.Eterna, centuries of horological expertise
Ever since it was established in 1856 Eterna has turned out fine, high-quality timepieces highlighting the craftsmanship and professional commitment of generations of artisan watchmakers. Their significant contributions to the craft and science of horology include the design of the Eterna-Matic winding rotor on ball bearings and the first wristwatch fitted with an alarm mechanism. It goes without saying that last year's launch of the Eterna Spherodrive ranks among the milestones of the brand's history. A revolution in terms of operational regularity, smoothness and longevity, it is ideally suited to the Madison Eight-Days' Eterna calibre 3510. Today Eterna ranks as one of a handful of full-fledged watch manufacturers actively seeking new avenues of development with the highest quality materials while maintaining traditional workbench production. Over the years, it has often come up with innovative answers to centuries-old technical challenges. Today one of the last remaining independent watch manufacturers, Eterna is owned by Ferdinand Alexander Porsche. Alongside its traditional production, it has been assigned the licence for the acclaimed Porsche Design watch collection.
Madison Eight-Days with Eterna Spherodrive
Technical Specifications Movement: Eterna calibre 3510; hand-wound mechanical movement with Eterna Spherodrive; power reserve 192 h; 28,800 v.p.h.; 22 jewels; length: 33.2 mm (14 3/4 lines); width: 27.2mm (12 lines); 7 ball bearings; Glucydur balance wheel; hours, minutes and seconds, big date and power-reserve indicator. Dial/hands: silver, grey or black, cobbled-pattern structure at centre and sunray brushing; rhodium-plated or gold-coloured baton hour markers; rhodium-plated or gold-coloured centre hour and minute hands with white luminous compound; rhodium-plated or goldcoloured seconds hand; big date dial aperture at 2 o'clock; power reserve indication between 7 and 8 o'clock; scratch-resistant, anti-reflective sapphire crystal. Case/back: polished stainless steel tonneau shaped case with decorative pattern on either side; case back secured with sapphire crystal opening, secured by four screws; water-resistant to 30 m (3 bars); length: 53.3 mm; width: 38.5 mm; height: 13.25 mm. Bracelet/clasp: brown, grey or black Louisiana alligator leather strap with polished stainless steel folding clasp.
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