KAROSHI K-011/OS-01 Limited Edition

KAROSHI is a luxury watch brand founded by Swiss designer Stéphane Lacroix-Gachet, known for his exceptional works for brands like Hamilton, DeWitt and Rado.

KAROSHI K-011/OS-01, the first creation from the brand, was born from an innovative idea: To make a mechanical timepiece without a shell (case). Instead of a regular watch case, this wristwatch features a UNIBODY BASEPLATE made of grade 5 titanium. The movement is fixed on this base-plate, whose both sides are secured with sapphire crystals.

The self-winding mechanical movement (CALIBRE 0S-01) features a 60 second 2.5 Hz Tourbillon regulator, which is large enough to fit in a 48mm diameter baseplate. With a 14 mm balance wheel, a cage diameter of 19 mm, the magnificent Tourbillon mechanism is visible at 6 o’ clock.

The stepped- and constant-wheel are placed on top of each other. They catch up to each other every second. The sequential trigger work together for an accurate true second dance. For increased winding efficiency, the movement has a Pellaton winding system, driven by a platinum skeletonized micro rotor.

Technical details

Limited edition of 99 pieces

Base plate
Skeleton Titanium grade 5 micro-blasted unibody baseplate
Diameter: 48 mm
Weight: 21 g

Other features
Sapphire crystal with internal and external anti-reflective treatment
9.6 mm edge thickness
Thickness at the center of the sapphire glasses 14.2 mm
Dauphine hands
Total diameter of the watch: 50 mm
Weight of the watch: 60 g
Water resistance up to 3 atm / 30 m / 100 ft

Calibre karoshi os-01
Mechanical self winding movement
Power reserve: 50 hours
318 components / 45 jewels
2,5Hz (18’000 vph) balance frequency oscillation
14 mm balance wheel
Sequential trigger dead beat second
Platinum micro blasted micro rotor (11.6 g)
Pellaton winding system
Titanium grade 5 bridges
Chamfer and Maret polishing and on steel components
Burnished pivots
Circular decorations on all wheels
Geneva stripes decoration on back bridges
Chamfered and polished screws

Unibody rubber strap
Titanium grade 5 triple folding clasp, karoshi skull cover

Designed, developed and manufactured in Switzerland