Konstantin Chaykin published Master of Days on its own site on October 2, 2026, and there is no calibre inside doing the switching. On a conventional calendar watch the movement sends an impulse that flips the day. Here the owner does it. Pushing the cufflink through a shirt cuff advances a blue pointer to the next day of the week, so the wearer supplies the motion the movement normally would, once a day, as a side effect of getting dressed.
Chaykin calls the mechanism caliber A.01-1. It measures 13.9mm across and 2.1mm thick and runs on two jewels. A shaft hidden inside the cufflink post carries the motion to a switching lever, whose tooth catches one arm of a seven-pointed star and turns it a single step while a jumper holds the new position. Each cufflink is built from 40 components, 13 in the case and 27 in the indication assembly, for 80 across the pair. The polished and brushed titanium case is 18mm wide and 5.7mm thick, under a 15mm sapphire crystal with anti-reflective coating.
The finishing is done by hand to watch standards, per Chaykin’s product page: the mainplate is sandblasted, edges are bevelled and polished to a mirror, and the inside surface of the case carries circular graining that disappears from view once the cufflink is assembled.
The price is RUB 450,000 including VAT, roughly $5,390 USD at current exchange rates. Chaykin sells direct: the product page carries a purchase link and offers an appointment at the brand’s boutique in GUM in Moscow. No production limit has been announced, and the brand has not published a separate shipping date.