Octanis Sigma GMT 42 - Founders Edition - Civil Twilight

The First Light of Discovery: High-Visibility Precision for the Modern Explorer.

Named after the south polar star, the Sigma GMT blends land, air, and sea navigation into an unmistakable architectural tool.

Civil Twilight: Golden Hour Meets High Contrast

Civil Twilight begins as the sun sits just 0 to 6 degrees below the horizon.  The golden window when sunlight illuminates terrestrial landscapes while terrestrial lights begin to flicker on. It is the moment of peak visibility, where clear optics and immediate legibility matter most.

The Civil Twilight edition pays homage to this transition with a rich, forest-green dial accented by a stark white internal 24-hour rehaut. Designed with a clean, tactical-meets-refined palette, it brings bold color to everyday wrist presence without compromising technical utility.

True Flyer GMT Power: The Miyota 9075

When your journey takes you across time zones, the Sigma adapts on the fly. Powered by the Japanese Miyota 9075 automatic caliber, this is a genuine Flyer GMT.

Pulling the crown allows you to independently jump the main hour hand in one-hour steps without stopping the seconds hand or disturbing your reference time.

• High-Beat Smoothness: 28,800 vph (4Hz) sweep for smooth, continuous precision.

• Exhibition Sapphire Caseback: Display back lets you inspect the automatic winding weight and balance assembly at work.

Dual-Crown Internal Rehaut: 3 Time Zones on Command

Protected beneath scratch-resistant sapphire crystal, the internal rotating 24-hour rehaut is controlled via a dedicated secondary crown at the 2H position.

Free from the wear and snagging of outer bezels, this dual-crown setup provides instantaneous third-time-zone calculation while maintaining 100 meters (10 ATM) of water resistance.

Hand-Inspected & Hand-Regulated

In the tradition of classic octants, precision isn't optional. Every single piece in this 120-unit Founder’s Edition run is hand-inspected and regulated on-site before leaving our workshop.

What’s Included in Your Voyage Package:

• 3-Watch Travel Roll: Premium travel case for three timepieces.

• Bonus FKM Rubber Strap: Color-matched in clean white for water and active wear.

• Quick-Adjust Bracelet: Integrated micro-adjustment clasp for instant on-the-wrist resizing.

• Commemorative Warranty Card & Octanis Seal.

Technical Specifications

Instruction Manual Download

In stock and ready for shipment!