Unimatic · Microbrand · Italy
Unimatic Modello Tre U3S
- Sellita SW510
- 41.5 mm × 16.4 mm
- Sapphire crystal
- 300 m water resistance
Where to buy
Movement
- Caliber
- Sellita SW510
- Type
- Automatic
- Tier
- Upper
- Complications
- Hours, Minutes, Small seconds, Chronograph
- Frequency
- 28,800 bph
- Power reserve
- 62 h
- Hacking
- Yes
- Accuracy (factory)
- —
Case
- Diameter
- 41.5 mm
- Lug to lug
- 51.2 mm
- Thickness
- 16.4 mm
- Lug width
- 22 mm
- Material
- Steel (316L)
- Hardening
- —
- Water resistance
- 300 m
- Crown
- Screw-down
- Case back
- Display, screw-down
- Bezel
- Unidirectional, 120 clicks
- Finishing
- Brushed (sandblasted black DLC on U3S-M)
Crystal & dial
- Crystal
- Sapphire
- Shape
- Double-domed
- Anti-reflective
- Inner
- Lume
- Super-LumiNova (colour varies by edition; none stated for the U3S-M)
Bracelet & clasp
- Style
- —
- Links per row
- 3
- Solid end links
- —
- Solid links
- —
- Link attachment
- —
- Taper
- —
- Quick release
- —
- Half links
- —
- Clasp
- —
- Micro-adjust
- —
- Diver extension
- —
Straps
- Strap 1
- Leather, Grey 'bump' leather two-piece strap, the extra strap on U3S-HS
Weight
- Head only
- 105 g
- On bracelet
- 220 g
- On strap
- —
Prices
Variants
| Name | Reference | Dial | Bezel | Configuration | Status |
|---|---|---|---|---|---|
| U3S-HS Henry Singer | U3S-HS | grey, two subdials with concentric circles (small seconds, 30-minute counter), matte white open seconds rail, custom Super-LumiNova with OL orange accents, no date | Henry Singer grey ceramic diving insert, BGW9 white markers | steel bracelet + grey leather two-piece strap | Limited (36) |
| U3S-HSP Henry Singer | U3S-HSP | matte pink, two subdials (small seconds, 30-minute counter), C1 lume, matte white open seconds rail and trims, matte pink hands, no date | brushed steel tachymeter insert, engraved markers | brushed steel bracelet | Limited (1) |
| U3S-M Maxfield | U3S-M | matte black index dial, two off-black subdials with concentric circles (small seconds, 30-minute counter), off-black seconds rail and trims, matte black skeleton hands, no lume stated, no date | matte black DLC sandblasted steel insert | black DLC sandblasted steel bracelet | Limited (30) |
About this entry
79% of key specs known. Missing: hardening, end links, link attachment, clasp micro-adjust.
Unimatic's automatic chronograph: the Modello Tre chrono-diver with a Swiss Sellita SW510 BH b in place of the U3's Seiko VK64, in a thicker case with a sapphire exhibition caseback, sold as numbered limited editions, each recorded as a variant (the titanium edition is the Modello Tre U3S Titanium). Unimatic called the U3S-HS of 2025 its first automatic chronograph available for sale. Common specification, from the U3S-M and U3S-HSP sheets (2025) and the descriptions: 40mm case, 41.5mm across the bezel (recorded as the diameter), 51.2mm lug to lug, 28.4mm case opening, 15.2mm without the crystal and 16.4mm with it, 22mm lugs, 316L steel, 105g for the head and 220g on the bracelet, screw-down sapphire exhibition caseback, 8mm screw-down 'Alchemical Sun' crown between two oversized 5.5mm screw-down chronograph pushers, no crown guards (photos), individually tested to 300m, 120-click unidirectional bezel, 2.5mm double-domed sapphire with anti-reflective coating on the inner side. The SW510 BH b is the horizontal bicompax, no-date execution of the SW510: small seconds at 9, 30-minute counter at 3, centre chronograph seconds, no 12-hour counter (the U3S-M description and the photos agree); Unimatic quotes 28,800 bph, 27 jewels, 56h minimum and 62h typical power reserve and +/-5 s/day, and writes 'Chronometer' under caliber features as it does for the VK64, without naming a grade or claiming regulation, so none is recorded. The bracelet has three links per row (photos); its clasp isn't described. Bezel insert, dial, case finish and straps vary by edition. Edition details. U3S-HS (2025, 36), made with the London retailer Henry Singer: grey dial with concentric-circle subdials, matte white open seconds rail and custom lume with OL orange accents, Henry Singer grey ceramic diving insert with BGW9 markers, engraved rotor, steel bracelet plus a grey leather strap; its page links no spec sheet; the price is the Italian euro price, VAT included, its page shows, although the description ends '2950 EUR + VAT'. U3S-HSP (2025, one piece), also with Henry Singer, for breast cancer research: matte pink dial with C1 lume, brushed steel tachymeter insert with engraved markers, Henry Singer exhibition caseback, steel bracelet; offered at Sotheby's Important Watches auction in New York on 8 December 2025, with the proceeds going to the AIRC Foundation for Cancer Research, so it had no retail price and none is recorded; its page reuses the U3S-HS hero file name, but the photo shows the pink dial, and its sheet says brushed where its page spec list says sandblasted. U3S-M (2025, 30), made with Maxfield Los Angeles and sold only there: all-black, matte black index dial with off-black concentric-circle subdials and skeleton hands, no lume stated, matte black DLC steel insert, black DLC sandblasted case and bracelet, rotor engraved Maxfield; the Unimatic store shows 0 and the page gives the final price as 4,295 USD at Maxfield, as Maxfield's own page (published November 2025) does, recorded.
Last verified: 2026-10-25. Edit or correct this entry.
Sources
- UNIMATIC, Modello Tre U3S-HS (product page) accessed 2026-10-25
- UNIMATIC, Modello Tre U3S-HSP (product page) accessed 2026-10-25
- UNIMATIC, Modello Tre U3S-M (product page) accessed 2026-10-25
- UNIMATIC, Modello Tre U3S-M tech specs (PDF, 2025) accessed 2026-10-25
- UNIMATIC, Modello Tre U3S-HSP tech specs (PDF, 2025) accessed 2026-10-25
- Maxfield, UNIMATIC | Maxfield Chronograph Watch (U3S-M product page) accessed 2026-10-25