Studio Underd0g has built its name on colour, wit and a refusal to make anonymous watches.
The new 04SERIES Calendar keeps that spirit intact, but moves the British microbrand into more ambitious territory with its first automatic watch and its first genuinely complicated display.
Instead of treating the calendar as a purely formal complication, the brand has centred the watch around something pleasingly human, the weekend.
At a glance
- Studio Underd0g has introduced the 04SERIES Calendar, its first automatic and most complicated watch to date.
- The watch combines a retrograde pointer date, moonphase and a manually set weekend indicator arranged around the dial.
- It is priced at £750, with orders opening Tuesday, November 17, 2026, at 3pm UK time.
A calendar that marks Saturdays and Sundays
The defining idea behind the 04SERIES Calendar is a ring of chamfered windows near the edge of the dial that shows where every weekend falls in the current month.
The display is aligned with the date track and is quick-set at the start of each month, leaving Saturdays and Sundays visible at a glance.
Studio Underd0g says the windows are CNC cut rather than stamped, a detail intended to give the apertures a cleaner, sharper edge.
The date is shown by a central pointer, but the brand has avoided one of the awkward visual compromises that can come with pointer-date moonphase watches.
Rather than letting the hand sweep across the moonphase once a month, the 04SERIES uses a retrograde date that jumps back to 1 at the end of the month.
The date can be quick-set through a hidden pusher at 2 o’clock.
Together, the watch displays hours, minutes, a retrograde pointer date, the weekend indicator and a moonphase, which makes this the most complex Studio Underd0g model so far.
The first automatic built around a Studio Underd0g concept
The movement is the ST-2115B Seagull Automatic for Studio Underd0g, developed with Seagull after the two companies previously worked together on the brand’s 01SERIES chronograph calibre.
Studio Underd0g says the 04SERIES project took two years and required 34 newly designed parts developed, tooled and tested specifically for this watch.
The movement runs at 28,800 vibrations per hour and offers a 42-hour power reserve.
It is rated at -10/+15 seconds per day, and the automatic calibre is visible through a sapphire caseback.
The figures aren’t being positioned as chronometer territory, but the more interesting point is the architecture, which was created to serve the watch’s unusual calendar concept rather than simply dressing up an existing layout.
Four dial treatments and two case sizes
The launch collection comprises four sky-themed dials, each using a two-layer construction with a radial-brushed base and a satin-finished top dial.
Cloud10 pairs a sky-blue dial with soft pink accents.
Arabian Sky uses a burnished gold tone with emerald accents on the moonphase and weekend windows.
Shepherd’s Delight brings a rich red dial with purple moonphase accents, while 0vercast takes on a slate grey-blue look with a darker gunmetal character.
Each dial is offered in either 37mm or 38.5mm, giving buyers a choice without changing the overall design language.
Both case sizes share a 13.5mm thickness including the crystal, a 10.5mm measurement excluding it, a 44.5mm lug-to-lug span and 20mm lugs.
The case is made from 316L stainless steel with a three-part construction, sapphire crystal front and back, and 5 ATM water resistance.
Assembly, ordering and ownership details
Every 04SERIES Calendar is assembled in-house at Studio Underd0g’s base in Maidenhead, UK.
The brand says each watch is built from start to finish by a single team member, whose initials appear on the paperwork supplied with the watch.
The watch is delivered on a leather strap made by The Strap Tailor, tapering from 20mm to 16mm with quick-release spring bars and a signed steel buckle.
Straps are offered in small, standard and large lengths, with additional straps available to add at checkout.
The Studio Underd0g 04SERIES Calendar is priced at £750 across all four dial variants and both case sizes.
Orders open on Tuesday, November 17, 2026, at 3pm UK time, with registration of interest available before then on the brand’s product pages.
Delivery timing will depend on the total number of orders, which Studio Underd0g says will be fulfilled on a first-come, first-served basis.
Shipping is free on watch orders, and US orders ship duties paid.
Details & Specifications
| Brand | Studio Underd0g |
|---|---|
| Model | 04SERIES Calendar |
| References | 04CLCH Cloud10, 04ASEM Arabian Sky, 04SDNA Shepherd’s Delight, 04OVCA 0vercast |
| Case size | 37mm or 38.5mm |
| Thickness | 13.5mm including crystal, 10.5mm excluding crystal |
| Lug to lug | 44.5mm |
| Lug width | 20mm |
| Case material | 316L stainless steel, three-part construction |
| Crystal | Sapphire front crystal and sapphire caseback |
| Water resistance | 5 ATM |
| Dial | Two-layer dial with radial-brushed base and satin-polished top dial |
| Movement | ST-2115B Seagull Automatic for Studio Underd0g |
| Frequency | 28,800 vph |
| Power reserve | 42 hours |
| Accuracy rating | -10/+15 seconds per day |
| Functions | Hours, minutes, retrograde pointer date, weekend indicator, moonphase |
| Strap | Leather by The Strap Tailor, 20mm tapering to 16mm, quick-release spring bars, signed steel buckle |
| Assembly | In-house in Maidenhead, UK |
| Price | £750 |
| Availability | Orders open Tuesday, November 17, 2026, at 3pm UK time |
The 04SERIES Calendar feels like a natural next step for Studio Underd0g, keeping the brand’s taste for offbeat colour while giving collectors something more mechanically and conceptually substantial to consider.
