The Omega Speedmaster HB-SIA Co-Axial GMT Chronograph is a prestigious numbered edition timepiece created in honour of the Solar Impulse project and its mission to circumnavigate the globe powered solely by solar energy. Reference 321.90.44.52.01.001, this iconic Speedmaster variant is built on a 44.25mm Grade 2 titanium case paired with a matching titanium bracelet secured by a butterfly clasp, achieving a total weight of approximately 128 grams for a balanced yet substantial feel on the wrist.

The black carbon fibre dial showcases a small seconds sub-dial, a 30-minute recorder, and a 12-hour recorder alongside central chronograph and GMT hands, all framed by a black bezel featuring a tachymetric scale. The scratch-resistant sapphire crystal with anti-reflective treatment on both sides ensures exceptional dial clarity. The caseback is engraved with the patch of the Solar Impulse HB-SIA project, commemorating this landmark aviation achievement.

At its core beats the self-winding Omega Co-Axial Calibre 3603, a COSC-certified chronometer movement with a 52-hour power reserve. The Co-Axial escapement reduces friction on moving parts, extending the intervals between servicing while maintaining long-term accuracy. The watch also features a time zone function allowing the hour hand to be adjusted independently across time zones. Water resistance is rated to 10 bar (100 metres / 330 feet), with lugs spanning 21mm and a case thickness of 15.75mm.