Eterna Watch Madison Eight 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. Whats more, a cut off mechanism deactivates the balance wheel after eight days, when the movements power is too low for precision timekeeping... another masterful refinement from Eterna.