Blancpain Villeret Semainier 6637 Week Calendar Watch

This is Blancpain’s first wristwatch to feature a week-of-the-year display. Along the outermost ring of the dial, the numerals 1–53 represent the weeks of the year, allowing the wearer to instantly see how many weeks have passed — a poetic reminder of time’s passage and a practical way to plan each new week, whether in haste or leisure.

The grand feu enamel dial embodies the classical aesthetics of the Villeret collection, with Roman numeral hour markers, hollow leaf-shaped hands, and a curved blued-steel hand indicating the current week. The day-of-the-week subdial is positioned at 9 o’clock, while the date display sits at 12 o’clock. Although there is no dedicated month display, one can infer the approximate month by noting where the week hand points relative to the 12-hour scale — for instance, in the example shown, it reads Friday, May 31st, Week 21.
The week indicator is adjusted via a concealed corrector at 1 o’clock, the day-of-the-week via another hidden corrector at 11 o’clock, and the date via the crown.
Powering the watch is the in-house Caliber 3738G2 automatic movement, featuring three series-coupled mainspring barrels that deliver an 8-day power reserve. As a result, wearing the watch once or twice a week is enough to keep it fully wound — a thoughtful design that perfectly suits a timepiece built around the rhythm of the week.