Studio Underd0g launches the 04Series Calendar, its first calendar watch

Studio Underd0g has announced its fourth collection, the 04Series Calendar, marking the British microbrand's first calendar complication and its first automatic watch. It pairs a retrograde pointer date with a moonphase display and, most unusually, a peripheral indicator that marks every Saturday and Sunday of the month.

The collection launches on 17 November 2026 through the brand's website and by appointment at The D0ghouse in Maidenhead, England. Prices start at £750, $1,100, €800 or CHF 800 including VAT where applicable, with free worldwide delivery and a two-year warranty.

Two case sizes are offered, 37mm and 38.5mm, both in three-part 316L stainless steel. The watches measure 13.5mm thick with the double-domed sapphire crystal and sapphire caseback, or 10.5mm without. Lug-to-lug is 44.5mm, and water resistance is rated at 50 meters.

The movement built with Seagull

The new caliber is a Seagull Automatic ST-2115B developed over more than two years with the Chinese manufacturer. Over 30 bespoke components were designed, tooled and tested before being integrated into one of Seagull's automatic base movements. The partnership's rotor displays the collaboration through the sapphire back.

The movement beats at 28,800 vibrations per hour and offers a 42-hour power reserve with hacking seconds; accuracy is rated at plus 15 to minus 10 seconds per day. Watches are assembled, regulated and inspected in Great Britain at the brand's D0ghouse workshop.

Founder Richard Benc launched Studio Underd0g in 2020 with the idea of serious watches that do not take themselves too seriously. The 01Series used Seagull-powered chronographs, followed by the sapphire-and-screw-dialed 02Series field watches and the Sellita-powered monopusher 03Series chronographs.

Four dial colourways take their names from the views outside an office window as thoughts turn toward the weekend. Cloud10 is a silvery light blue, Arabian Sky a golden hue, Shepherd's Delight a cherry red, and 0vercast a dark grey. Each dial carries a satin-polished treatment and layered finishes.

How the calendar display works

The retrograde pointer date was chosen deliberately: a sweeping date hand can cover the moonphase, so the pointer snaps back instead. A recessed pusher at 2 o'clock quick-adjusts the date, while a corrector at 8 o'clock sets the moon. Leaf-shaped hands tell the hours and minutes.

The weekend display runs around the dial's edge through chamfered, CNC-machined windows aligned to each date. Every five days the light portions of the underlying disc give way to two darker bands, flagging the weekends. It is adjusted via the crown's second position at the start of each month.

Because that weekend wheel is manual rather than mechanically programmed, the concept recalls Krayon's Anyday, which lays out an entire month with weekday and weekend indication. The gap is large: Krayon's piece is a sophisticated agenda with a matching price, where Studio Underd0g's runs to a pair of zeros fewer.

Straps come from The Strap Tailor in Buckinghamshire, available in four leather options with quick-release spring bars that taper from 20mm to 16mm, closed by a stainless steel pin buckle. A mesh bracelet with a folding clasp is offered as an alternative for a more casual look.

The larger watch reads with a thicker bezel and stubbier lugs, a subtle 1.5mm separation aimed at pleasing both vintage-leaning and modern collectors. Because the lug-to-lug is identical, only the central portion of the case grows, so neither size looks out of proportion.

We have written before about the mechanics behind calendar watches, from retrograde pointers to moonphase subdials, in our guide to watch complications. The 04Series is priced well under the strategic €1,000 mark that has defined the brand's accessible positioning.

The movement is not chronometer certified, and the brand wears its quirks openly: there are no numerals, only a printed chapter ring near the centre. Lume is absent. Those are the trade-offs of a moonphase and retrograde date at $1,100.

The case carries a flat stepped bezel with polished bevels, a design that borrows classic codes of the genre while keeping a contemporary mood. A signed crown completes the three-part construction. The reference numbers run 04CLCH, 04ASEM, 04SDNA and 04OVCA across the four dials.

Production is not limited, and orders open on underd0g.com on 17 November with viewings at The D0ghouse. The brand has not said how long the first batch will run, nor whether the bespoke Seagull parts carry servicing caveats.