Studio Underd0g 04SERIES Calendar Brings a Weekend Twist to a Dressier Watch

Studio Underd0g has built much of its reputation on playful ideas, but the 04SERIES Calendar moves the brand into a more dressed-up register.

It’s the British brand’s fourth watch family, joining the 01SERIES chronograph, 02SERIES field watch and 03SERIES monopusher.

The surprise is that this more formal calendar watch still finds room for the oddball detail Studio Underd0g tends to do best.

At a glance

• Studio Underd0g’s 04SERIES Calendar is the brand’s first calendar watch and its fourth core watch family.
• The display combines a moonphase, retrograde pointer date and an unusual manually set weekend indicator.
• All four colourways are priced at £750, with free worldwide shipping and availability from November 17.

Four dials built around reflected colour

The 04SERIES Calendar launches in four colourways, each pairing a high-sheen dial with a contrasting accent colour.

Cloud10 uses a silver dial with red accents, Arabian Sky pairs copper with blue, Shepherd’s Delight combines red with purple, and 0vercast sets navy blue against orange.

The dial finish is central to the character of the watch.

A satin-polished surface catches surrounding light strongly enough that the colour can shift depending on where the watch is worn and what it reflects.

That effect is most dramatic on Cloud10, whose silver surface can pick up nearby tones almost like a mirror.

0vercast has its own quieter transformation, moving visually between deep navy and near-black depending on the light.

A calendar display that marks the weekend

The layout is more involved than the compact case might first suggest.

A moonphase sits at 6 o’clock, framed by a polished outer ring and a circular-grained centre, with the moonphase disc rendered in the main accent colour of each variant.

Around it, the dial uses layered scales for the hours, minutes, weekend indication and retrograde pointer date.

The retrograde date is a practical design choice, as it keeps the date hand away from the moonphase display rather than allowing it to cross over the subdial.

The weekend indicator is the more unusual flourish.

Small boxes correspond with the date scale, with accented boxes marking weekend days and blank boxes marking weekdays.

It isn’t a passive complication.

The wearer sets the weekend boxes at the start of each month using the crown, and the pointer date also needs correcting after months with fewer than 31 days.

That small ritual makes the 04SERIES Calendar more interactive than a simple date watch, while keeping the information easy to read once set.

Compact steel cases and an exclusive automatic calibre

The steel case is offered in 37mm and 38.5mm sizes, both measuring 13.5mm thick.

The 37mm version has a 44.5mm lug-to-lug length, which keeps the dress-leaning proportions compact on the wrist.

Studio Underd0g has used a mix of brushed and polished finishing on the case, matching the watch’s balance of formality and colour.

Each colourway comes on a leather strap with a pin buckle.

0vercast is paired with navy, Arabian Sky with dark green, Cloud10 with light brown and Shepherd’s Delight with dark brown.

Through the exhibition caseback is the Seagull ST-2115B automatic calibre.

Studio Underd0g says the movement is exclusive to the brand, and quotes a 4 Hz operating frequency, -10/+15 seconds per day accuracy and a 42-hour power reserve.

The movement finishing includes perlage, with a plain silver centre and black-coated outer section.

Details & Specifications

The 04SERIES Calendar feels like Studio Underd0g maturing without becoming anonymous.

Its case, leather strap and moonphase layout point toward a dress watch, but the shifting dial colours and weekend scale keep enough mischief in the mix for collectors who came to the brand for something less predictable.