Unimatic · Microbrand · Italy

Unimatic Modello Quattro U4S

Ref. U4S · Limited · 2022 · Field

Unimatic Modello Quattro U4S-8B
Photo: Unimatic
  • Unimatic Modello Quattro U4S-8BB
  • Unimatic Modello Quattro U4S-8N
  • Unimatic Modello Quattro U4S-8O
  • Unimatic Modello Quattro U4S-HG Huckberry
  • Unimatic Modello Quattro U4S-HM Huckberry
  • Unimatic Modello Quattro U4S-HS Huckberry
  • Unimatic Modello Quattro U4S-KNT
  • Unimatic Modello Quattro U4S-MEOS Claesson Koivisto Rune
  • Unimatic Modello Quattro U4S-NPB
  • Unimatic Modello Quattro U4S-NPF
  • Unimatic Modello Quattro U4S-NPT
From $1,033 to $1,414
  • Sellita SW200-1
  • 40 mm
  • Sapphire crystal
  • 300 m water resistance

Movement

Type
Automatic
Tier
Upper
Complications
Hours, Minutes, Seconds
Frequency
28,800 bph
Power reserve
41 h
Hacking
Yes
Accuracy (factory)
—

Case

Diameter
40 mm
Lug to lug
49 mm
Thickness
—
Lug width
22 mm
Material
Steel (316L)
Hardening
—
Water resistance
300 m
Crown
Screw-down
Case back
Solid, screw-down
Bezel
Fixed
Finishing
Brushed

Crystal & dial

Crystal
Sapphire
Shape
Flat
Anti-reflective
Inner
Lume
Super-LumiNova (colour varies by edition; none stated on the U4S-MEOS)

Bracelet

Bracelet
—

Straps

Strap 1
Other, Two-piece TPU strap: black (U4S-8B), vintage navy (U4S-8N) or olive drab (U4S-8O) with brushed steel hardware signed UNIMATIC; pale blue (U4S-HG), meadow green (U4S-HM) or sandstone orange (U4S-HS) with sandblasted hardware signed UNIMATIC; KNT blue quick-release with black DLC brushed hardware (U4S-KNT); king red with a brushed steel buckle (U4S-MEOS)
Strap 2
NATO, Seatbelt NATO: black (U4S-8B, and the main strap on U4S-8BB), vintage navy (U4S-8N), olive drab (U4S-8O)
Strap 3
NATO, Grey nylon NATO, the extra strap on U4S-HG, U4S-HM and U4S-HS
Strap 4
NATO, Five nylon NATO straps, the extra straps on U4S-KNT: black, vinaccia, giallo ginestra, international orange, KNT blue
Strap 5
Leather, Black suede two-piece strap, the extra strap on U4S-8BB
Strap 6
Leather, quick release, Deer leather two-piece quick-release strap with brushed hardware signed UNIMATIC: Military green (U4S-NPB), Fumo grey (U4S-NPF), Tabacco brown (U4S-NPT)

Weight

Head only
98 g
On bracelet
—
On strap
112 g

Prices

VariantConfigurationTypePriceUSDAs ofSource
U4S-8B—Msrp920 EURincl. VAT$1,0332026-10-25link
U4S-8BB—Msrp980 EURincl. VAT$1,1002026-10-25link
U4S-8N—Msrp920 EURincl. VAT$1,0332026-10-25link
U4S-8O—Msrp920 EURincl. VAT$1,0332026-10-25link
U4S-HG Huckberry—Msrp1,040 EURincl. VAT$1,1672026-10-25link
U4S-HM Huckberry—Msrp1,040 EURincl. VAT$1,1672026-10-25link
U4S-HS Huckberry—Msrp1,040 EURincl. VAT$1,1672026-10-25link
U4S-KNT—Msrp1,260 EURincl. VAT$1,4142026-10-25link
U4S-MEOS Claesson Koivisto Rune—Msrp1,010 EURincl. VAT$1,1342026-10-25link
U4S-NPB—Msrp1,160 EURincl. VAT$1,3022026-10-25link
U4S-NPF—Msrp1,160 EURincl. VAT$1,3022026-10-25link
U4S-NPT—Msrp1,160 EURincl. VAT$1,3022026-10-25link

Variants

NameReferenceDialConfigurationStatus
U4S-8BU4S-8Bmatte black, GL light old radium lume, gold metallic trims and brushed ladder hands, lumed seconds tip, no dateblack TPU two-piece strap + black seatbelt NATOLimited (400)
U4S-8BBU4S-8BBmatte black, GL light old radium lume, gold metallic trims, matte black ladder hands, gold metallic seconds tip, no dateblack seatbelt NATO + black suede leather two-piece strapLimited (99)
U4S-8NU4S-8Nvintage navy, GL light old radium lume, gold metallic trims and brushed ladder hands, lumed seconds tip, no datevintage navy TPU two-piece strap + vintage navy seatbelt NATOLimited (400)
U4S-8OU4S-8Oolive drab, GL light old radium lume, gold metallic trims and brushed ladder hands, lumed seconds tip, no dateolive drab TPU two-piece strap + olive drab seatbelt NATOLimited (400)
U4S-HG HuckberryU4S-HGlichen grey grené, C5 lume, cool grey open seconds rail and trims, metallic grey blasted steel hands, no datepale blue TPU two-piece strap + grey nylon NATOLimited (75)
U4S-HM HuckberryU4S-HMmoss grené, light green lume, light green open seconds rail and trims, metallic grey blasted steel hands, no datemeadow green TPU two-piece strap + grey nylon NATOLimited (75)
U4S-HS HuckberryU4S-HSsandstone orange gradient grené, C1 lume, brown open seconds rail and trims, metallic grey blasted steel hands, C1 seconds tip, no datesandstone orange TPU two-piece strap + grey nylon NATOLimited (75)
U4S-KNTU4S-KNTmatte black, no markers, KNT blue Super-LumiNova BL logotype and phantom ladder hands, KNT blue seconds tip, no dateKNT blue TPU two-piece quick-release strap + five nylon NATO straps (black, vinaccia, giallo ginestra, international orange, KNT blue)Limited (120)
U4S-MEOS Claesson Koivisto RuneU4S-MEOScircular brushed steel, no markers, acid-etched logo, king red trims, brushed steel skeleton ladder hands, king red seconds hand, no dateking red TPU two-piece strap, brushed steel buckleLimited (99)
U4S-NPBU4S-NPBsatin moss, C1 lume, brushed steel hands, cool grey open seconds rail and trims, no dateMilitary deer leather two-piece quick-release strapLimited (200)
U4S-NPFU4S-NPFsatin fog grey, C1 lume, brushed steel hands, cool grey open seconds rail and trims, no dateFumo deer leather two-piece quick-release strapLimited (200)
U4S-NPTU4S-NPTsatin truffle brown, C1 lume, brushed steel hands, cool grey open seconds rail and trims, no dateTabacco deer leather two-piece quick-release strapLimited (200)

About this entry

80% of key specs known. Missing: thickness, hardening, bracelet offered.

The slim, Swiss-movement version of the Modello Quattro U4 military field watch: the same outline, with a fixed monoblock bezel, drilled lugs and crown guards, in a thinner case on a Sellita SW200-1 instead of the U4's Seiko NH35A, sold as numbered limited editions, each recorded as a variant. Worn & Wound reported the slim case at its first appearance, on the U4S-KNT in October 2022, as trimmed from 13.4mm to 12.4mm. Editions in another case material are separate models: bronze (Modello Quattro U4S Bronze), 18K gold (Modello Quattro U4S Gold), titanium (Modello Quattro U4S Titanium, and the ETA 2893-2 Modello Quattro U4S Titanium GMT) and forged carbon (Modello Quattro U4S Carbon). A black DLC coating, case finish (brushed or sandblasted), dial, lume, caseback engraving and straps vary by edition. Common specification, from Unimatic's current sheets for the steel U4S (the 2026 U4S-NPB, NPF and NPT) and the edition descriptions: 40mm case, 49mm lug to lug, 28.4mm case opening, 22mm drilled lugs, 8mm screw-down 'Alchemical Sun' crown, 2mm screw-down caseback, individually tested to 300m, 2.8mm flat sapphire with anti-reflective coating on the inner side, 316L steel (316 in the 2023 descriptions), 98g for the head and 112g on the NP editions' deer leather strap, recorded. Thickness is not recorded: the 2023 pages ('12.4 slimmer case') and Worn & Wound give 12.4mm without saying whether the crystal is included; the NP sheets give 12.7mm on their drawing but 13.7mm without the crystal and 13.9mm with it in their text, the Modello Quattro U4's figures; Unimatic's sheets for the same case in other materials give 12.4mm on the drawing against 12.75mm in the text (bronze U4S-BRZ-SI) and 12.7mm without and 13mm with the crystal (forged carbon U4S-C-TAB). Unimatic quotes the SW200-1 (SW200-1 b on the 2023 and later pages) with a 38h power reserve, and the 2026 sheets at +/-12 s/day with at least 38h (typically 41h), without naming a grade or claiming regulation. None of the editions shows a date window (photos), so complications are hours, minutes and seconds. Several descriptions are copied from another edition; where the page header, sheet and photos agree against the description they are followed, and the edition's sentence says so. Prices are the euro prices for Italy, VAT included, shown on each product page; where the store shows 0 instead, the price comes from launch coverage or is left blank. Edition details. U4S-8B, U4S-8N and U4S-8O (2023, 400 each): brushed case, black, vintage navy or olive drab dial with GL light old radium lume, gold metallic trims and hands, conversion-scale caseback, matching TPU strap plus seatbelt NATO. U4S-8BB (2024, 99, black DLC case), their all-black version: matte black hands with a gold metallic seconds tip, black seatbelt NATO plus a black suede strap; its description, copied from the U4S-8B, gives a TPU strap, an edition of 400 and a double-domed crystal, where its page header and photos show the suede strap and 99 pieces, recorded. U4S-HG and U4S-HM (2023, 75 each) were made with Huckberry: sandblasted case, lichen grey grené dial with C5 lume and cool grey trims (U4S-HG; 'gray' in its description) or moss grené dial with light green lume and trims (U4S-HM), blasted steel hands, granite or moss texture caseback signed UNIMATIC x Huckberry, pale blue or meadow green TPU strap plus a grey nylon NATO. U4S-HS (2023, 75), the third Huckberry edition: sandblasted case, sandstone orange gradient grené dial with C1 lume and brown open seconds rail and trims, blasted steel hands, sandstone texture caseback signed UNIMATIC x Huckberry, sandstone orange TPU strap plus a grey nylon NATO. U4S-KNT (2022, 120), the first U4S ('First Modello Quattro with 10% slimmer case' in its page header), was made with Kiton New Textures (KNT): black DLC brushed case, matte black dial without markers, KNT blue Super-LumiNova BL logotype and hands, UNIMATIC x KNT caseback, KNT blue quick-release TPU strap with black DLC hardware plus five nylon NATO straps; Worn & Wound gave a 900 USD launch price, and the recorded price is the euro price still shown on the sold-out page. U4S-MEOS (2023, 99) is the steel piece of the 'Ore' capsule that the Swedish architects Claesson Koivisto Rune designed for the opening of Unimatic's Milan flagship store, where it was released during the April 2023 Salone del Mobile (designboom), with the bronze U4S-MEOB (Modello Quattro U4S Bronze) and the 18K gold U4S-MEOG (Modello Quattro U4S Gold): circular brushed steel dial without markers, acid-etched logo and king red trims, brushed steel skeleton ladder hands, king red seconds hand, no lume mentioned, UNIMATIC x Claesson Koivisto Rune caseback, king red TPU strap; its page carries no year tag and no model name in its header (the other two pages of the capsule are tagged 2023). U4S-NPB, U4S-NPF and U4S-NPT (2026, 200 each), the Langhe Collection, made alongside the Modello Uno U1S-NP and Modello Due U2S-NP editions: satin moss, fog or truffle dial with C1 lume, brushed steel hands, cool grey open seconds rail and trims, Langhe caseback, Military, Fumo or Tabacco deer leather quick-release strap; the store carries no year tag, and they were listed in October 2026 (sheets dated 19 October 2026).

Last verified: 2026-10-25. Edit or correct this entry.

Sources