The Omega Speedmaster HB-SIA Co-Axial GMT Chronograph (Ref. 321.92.44.52.01.001) is a specialized, numbered-edition timepiece launched in 2008 to honor the Solar Impulse project an initiative aimed at flying around the globe using only solar energy. It combines a lightweight titanium construction with a highly advanced mechanical movement.

• GMT Complication: The central GMT hand features a distinctive orange airplane motif at its tip, inspired by 1970s Omega pilot watches, allowing the wearer to track a second time zone effortlessly. 

• Dial Typography: Features stylized Arabic numerals indicating the 24-hour second time zone scale integrated cleanly between the hours. 

• Commemorative Case Back: The solid case back features a large etched Solar Impulse HB-SIA project patch instead of the typical Speedmaster Seahorse emblem.

• Case & Material: 44.25 mm Grade 2 titanium case featuring a matte finish and a black fixed tachymeter bezel. 

• Dial: Made of genuine black carbon fiber, giving it a high-tech look that directly mirrors the experimental aircraft materials. 

• Movement: Powered by the Omega Co-Axial Calibre 3603, a self-winding, COSC-certified chronometer with a column-wheel chronograph mechanism and a 52-hour power reserve. 

• Strap: Fitted with a integrated black rubber strap featuring a unique honeycomb pattern reminiscent of the Solar Impulse aircraft structure.

• Water Resistance: Up to 100 meters (330 feet), making it much more robust than standard classic Speedmasters.