SBB Sigma Basalt Black (Limited Edition)

The Basalt Black is an inverse limited edition of the Sigma collection, reimagined through a monochromatic palette of black. Limited to 100 pieces.

SPECIFICATIONS

Case: 39 mm
Case Material: 316L surgical-grade stainless steel
Case Finish: PVD coating with anti-fingerprint treatment
Height: 10.4 mm
Lug Width: 20 mm
Lug-to-Lug: 46 mm
Dial Colour: Platinum Grey
Dial Finish: Sunburst and openworked
Crystal: Sapphire crystal with inner anti-reflective coating 
Water Resistance: 50 metres / 5 ATM (tested to ISO standards)
Weight: 131.5 g

Movement: Miyota Calibre 9015
Type: Automatic self-winding
Frequency: 28,800 vph (4 Hz)
Accuracy: In-house regulated to ｰ5～+15 sec/day
Power Reserve: 40~42 hours
Components: 86+
Jewels: 24
Manufacture: Made in Japan

STEALTH AESTHETIC
Enter the dark side with the Sigma Basalt Black. The eight-sided 39mm octagonal case measures just 10.4mm thin and is paired with an integrated bracelet finished in matte black, delivering a refined carbon-like aesthetic on your wrist. Designed with discipline and intention, this limited edition embraces restraint to achieve a minimal, monochromatic expression. The result is a contemporary dress watch that is shaped by modern aesthetics.

MONOCHROME CHARM
Defined by monochromatic shades of black, the Basalt Black explores visual interplay through light and texture rather than colour. Its smooth, matte finish is achieved through an ultra-fine bead-blasting technique, resulting in a surface that virtually eliminates reflections from the steel while preserving the intricate details of the watch. In contrast, the dial is finished with a sunburst treatment, revealing depth and a dynamic interplay of light within an otherwise restrained monochromatic palette.

Each limited edition piece is individually numbered and engraved on the case back.

THE BEATING HEART
This limited edition is powered by the premium-grade Miyota Calibre 9015, a robust, refined, and reliable self-winding automatic movement with a skeleton-designed oscillating weight finished in black, deliberately designed to complement its monochromatic design language. Fully assembled in Japan, it is one of the thinnest high-beat automatic calibres. Each movement is adjusted in-house across six positions to an accuracy of –5~+15 seconds per day.

ADAPTIVE COMFORT
The micro-abrasive sandblasted finish gives the multi-faceted steel links a contemporary stealth aesthetic. Seamlessly integrated with the case, the bracelet features a quick-release system and micro-adjustment mechanism, delivering a precise, tailored fit and enduring comfort on the wrist.