The Titanium Field Guide

Unimatic Modello Tre U3S-T-AA (x Automobili Amos x Sease)

The Unimatic Modello Tre U3S-T-AA (x Automobili Amos x Sease) is a current-production chronograph watch with a grade 2 titanium case, finished with sandblasted. At 77 g it sits among the lighter chronograph watches in the guide, and is priced above the $3,300 median for the category. The caseback is open, so the movement is visible.

All Unimatic watchesWatch chronograph watchesMicrobrandLightweightLightest, rankedDisplay back
Price
≈$5,263 (€4,510)
Material
Titanium
Grade / type
Grade 2
Weight
77 g (head only)
Water resistance
300 m
Type
Chronograph
Case diameter
40.0 mm
Origin
Italy
Movement
Automatic chronograph
Caliber
Sellita SW510 BH
Power reserve
62 h
Complications
Chronograph
Colour
Grey
Surface treatment
Sandblasted
Finish technology
Natural finish
Caseback
Titanium
Nickel-free
Unconfirmed (bracelet, strap, or clasp hardware not confirmed)
Bracelet / strap
TPU strap
Crystal
Domed sapphire, AR coated
Display back
Yes
Dial
Titanium gray, two subdials, tachymeter
Dial colours
Grey
Lume
Super-LumiNova GL
Availability
Offered
Status
x Automobili Amos x Sease; limited edition of 30, sold out
Not published
Reference, Thickness, Lug-to-lug, Hardness, Construction, Matching bracelet
High confidence Verified Jul 2026 Source: Unimatic
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Frequently asked questions

What is the case material of the Unimatic Modello Tre U3S-T-AA (x Automobili Amos x Sease)?

The Unimatic Modello Tre U3S-T-AA (x Automobili Amos x Sease) has a grade 2 titanium case with a titanium caseback. This is confirmed against the maker spec.

What size is the Unimatic Modello Tre U3S-T-AA (x Automobili Amos x Sease)?

It is 40.0 mm in diameter, and water resistant to 300 m.

How much does the Unimatic Modello Tre U3S-T-AA (x Automobili Amos x Sease) weigh?

About 77 g (head).

How much does the Unimatic Modello Tre U3S-T-AA (x Automobili Amos x Sease) cost, and is it available?

It is current-production and lists from $5,263.

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