Madison Eight-Days with Eterna Spherodrive
TOP
Runs nonstop for eight full days

Understated character best describes the Madison Eight-Days wristwatch. Its striking, textured dial, with twin baton hour markers, cobble-pattern centre and discreet brush-finished features a large date at 2 o’clock. A power-reserve indicator between 7 and 8 o’clock keeps track of up the eight full days of energy provided by its hand-wound movement. And that is not just any movement – the Eterna Calibre 3510 has a serially coupled pair of spring barrels working in tandem to deliver 192 hours of power smoothly and efficiently thanks to the Eterna Spherodrive system. What’s more, a cut-off mechanism deactivates the balance wheel after eight days, when the movement’s power is too low for precision timekeeping... another masterful refinement from Eterna.

 
TECHNICAL DETAILS
 
 
FEATURES
 
Reference: 
7720.41.13.1229
Case: 
Polished and brushed stainless steel
Dial: 
Silver sunray brushed with pavé structure
Hour markers: 
Gold-coloured index
Strap: 
Brown alligator leather
Clasp: 
Folding clasp
Movement: 
Eterna Calibre 3510
Movement Type: 
Hand-wound
Displays: 
h, min, s, big date, power reserve
Power Reserve: 
192h
Frequency: 
28,800 v.p.h.
MORE DETAILS
Jewels: 
23
Ball Bearing: 
7
Case Diameter: 
38.5 x 53.3 mm
Case Height: 
13.25 mm
Water Resistance: 
30 m
Crystal: 
Scratch-resistant, antireflective sapphire crystal
Case Back: 
Sapphir crystal opening
Crown: 
Non screw-down
8 days power reserve
A power-reserve indicator between 7 and 8 o'clock keeps track of up to 192 hours of energy.
Big Date
The date is displayed in large numerals on two separate discs. The fast date corrector is positioned at 10 o’clock on the case flank.
Manufacture movement
As with all Eterna Spherodrive systems, the Eterna Calibre 3510 boasts two serially coupled spring barrels mounted on ball bearings.
BACK TO WATCH PAGE
ZOOM IN
ZOOM OUT
VIEW 1
VIEW 2
Eterna Calibre 3510
Eterna’s rectangular Calibre 3510 movement embodies all the human ingenuity and inspired micro-engineering that have long distinguished Swiss watchmakers. For a start, it requires hand-winding no more than three times a month, and provides 192 continous hours of timekeeping precision in between. Unlike most watches, it boasts two spring barrels rather than a single one. They have been serially coupled for smoother, more reliable operation. Better still, the barrels rest on self-lubricating Eterna Spherodrive ball bearings that eliminate practically all the friction and tension that shorten the life of most movements. Calibre 3510 possesses a further refinement: a cut-off device that stops the balance wheel as soon as the energy remaining has is too low to guarantee precision.