Undone · Microbrand · Hong Kong

Undone Aqua

Limited · 2023 · Diver

Undone Aqua Brutus Mono with black-coated steel case and grey Brutus dial on a black rubber strap
Photo: Undone
  • Undone Aqua Brutus Mono solid caseback printed with the Brutus name
  • Undone Aqua black PVD steel case side
  • Undone Aqua Brutus with blue PVD case, black ceramic bezel and transparent Brutus dial on a black rubber strap
  • Undone Aqua Birdwell Birdie with steel case, black bezel and black dial with the Birdie mascot on a beige NATO strap
From $500 to $699
  • Seiko NH35A
  • 43 mm × 16.5 mm
  • Sapphire crystal
  • 300 m water resistance

Movement

Type
Automatic
Tier
Entry
Complications
Date
Frequency
21,600 bph
Power reserve
41 h
Hacking
Yes
Accuracy (factory)
-20 / +40 s/day

Case

Diameter
43 mm
Lug to lug
—
Thickness
16.5 mm
Lug width
22 mm
Material
Steel (316L)
Hardening
—
Water resistance
300 m
Crown
—
Case back
—
Bezel
60-minute dive
Colour coating
black PVD (Brutus Mono) or blue PVD (AQUA Brutus)

Crystal & dial

Crystal
Sapphire
Shape
—
Anti-reflective
—
Lume
—

Bracelet

Bracelet
Not offered

Straps

Strap 1
Rubber, Black rubber strap
Strap 2
NATO, Beige NATO strap (Birdwell Birdie)

Weight

Head only
—
On bracelet
—
On strap
—

Prices

VariantConfigurationTypePriceUSDAs ofSource
Brutus Mono—Msrp699 USD$6992026-10-24link
AQUA Brutus—Msrp580 USD$5802026-10-24link
Birdwell Birdie—Msrp500 USD$5002026-10-24link

Variants

NameReferenceDialBezelConfigurationStatus
Brutus MonoCOL-POP-MONO-BRUTUSgrey with a black-and-white Brutus figure, no date window; black-coated caseblack 60-minute dive bezelblack rubber strapLimited (100)
AQUA BrutusCOL-POP-BTStransparent dial showing the movement, with Brutus and round markers, date at 3; blue PVD caseblack zirconium dioxide ceramic 60-minute dive insertblack rubber strapLimited (150)
Birdwell BirdieCOL-Birdwell-Beigeblack dial with Birdwell's "Birdie" mascot throwing a shaka, his arms as the hour and minute hands, no date windowblack, beige numeralsbeige NATO strap—

About this entry

60% of key specs known. Missing: lug-to-lug, weight, hardening, AR coating, crown, lume.

Undone's 43mm steel dive watch, which the brand calls the AQUA (its POPEYE & FRIENDS "AQUA Brutus" listing; the case-side photo here is filed as "Aqua2_PVD_blk"). Recorded apart from the titanium Aquadeep and the forged-carbon Aqua Carbon because of the steel case, which also measures 47mm including the crown where the Aquadeep measures 51mm including crown and crown guard. Spec table on the Brutus Mono: Japanese TMI NH35, 316L steel, sapphire crystal, 43mm excluding the crown (47mm including it), 16.5mm including the crystal, 30 ATM / 300m. The Brutus Mono photos show a black-coated case, no date window and a solid caseback printed "BRUTUS". The 22mm lug width is from the strap photo's file name ("22mm_rubber_blk"). No lug-to-lug, weight, lume or crown details are published, and bezel details only for the AQUA Brutus (below). Sold out on 2026-10-30. Editions. Brutus Mono (listed January 2023, COL-POP-MONO-BRUTUS, USD 699, 100 pieces): Popeye licence; part of Undone's "Monochrome Collection" of "colour-washed mods" that began with POPEYE Mono (300 pieces, a 40mm Basecamp- case listing) and BRUTUS Mono; black-coated case, grey dial with a monochrome Brutus, black rubber strap. POPEYE & FRIENDS AQUA Brutus (COL-POP-BTS, USD 580, 150 pieces serialised on the caseback; sold out on 2026-10-30): blue "hard PVD" coated case (the text says harder than stainless steel, no figure given), Brutus floating on a transparent dial that shows the movement, a date window at 3, a black zirconium dioxide ceramic bezel insert, an "ultra thick" sapphire crystal with inner anti-reflective treatment, a black rubber strap (photo filed "22mm_rubber_blk") and a see-through caseback printed "BRUTUS Limited Edition"; its spec table reads "NH35A/ NH39", 316L steel, sapphire, 43mm excluding the crown (47mm including it) and 16.5mm including the crystal, but 50 ATM / 500m, while its caseback photo (filed "Brutus_04_300m") reads "pressure tested to 300 meters" and the Brutus Mono table gives 300m, so the model keeps 300m. UNDONE x Birdwell "Birdie" 60th Anniversary (store title "UNDONE x Birdwell Beige Automatic", COL-Birdwell-Beige, USD 500; sold out and tagged archive on 2026-10-30; called a "collector's edition", with no number given): for the 60th anniversary of the California surf brand Birdwell; black dial with Birdwell's 1964 "Birdie" mascot throwing a shaka, his arms as the hour and minute hands, a black bezel with beige numerals, a tonal beige NATO strap and a caseback with a "Birdwell 60 Beach Breaks" medallion. Its spec table gives "NH35A/ NH39", 316L steel, sapphire crystal, 43mm excluding the crown (47mm including it), 16.5mm including the crystal and 30 ATM / 300m, and the listing reuses the steel Aqua's side photo ("Aqua2_steel"); its text names an NH39, but the dial shows neither the NH39's open-heart aperture nor its 24-hour indicator, so the model's NH35 is kept.

Last verified: 2026-10-30. Edit or correct this entry.

Sources