Omega 325.92.43.79.01.002 (Pre-owned - Good) — USD 4,170 on eBay

The Omega Speedmaster HB-SIA Co-Axial GMT, reference 325.92.43.79.01.002, represents a fascinating chapter in the Speedmaster's storied history, produced between 2012 and 2016. This particular series was conceived to celebrate the pioneering spirit of the Solar Impulse project, an ambitious endeavor to circumnavigate the globe using only solar power. While the Speedmaster is globally recognized for its lunar heritage and association with space exploration, the HB-SIA models forge a connection to a different realm of human innovation: sustainable aviation and scientific advancement, underscoring Omega's commitment to pushing boundaries across various fields. The design of the Speedmaster HB-SIA Co-Axial GMT is characterized by its substantial 44 mm case, expertly crafted from lightweight yet robust titanium. This choice of material not only enhances wearer comfort but also subtly echoes the advanced engineering principles of the solar-powered aircraft it commemorates. The watch presents a striking black dial, providing optimal legibility for its various indications, including the crucial GMT complication, which allows for the tracking of a second time zone – a highly practical feature for international travelers and aviators. Its aesthetic retains the fundamental Speedmaster DNA while incorporating subtle cues befitting its unique inspiration. Driving the reference 325.92.43.79.01.002 is Omega's automatic Caliber 3603. This sophisticated movement incorporates the brand's celebrated Co-Axial escapement, a technological marvel known for its superior precision and long-term performance stability, reducing friction and extending service intervals. The integration of this advanced movement with the GMT function positions the HB-SIA Co-Axial GMT as a technically impressive timepiece within the Speedmaster family. With a water resistance of 50 meters, it is well-suited for daily wear. For collectors, the HB-SIA series stands out as a distinctive and thematic variant, offering a compelling blend of advanced materials, a useful complication, and Omega's cutting-edge Co-Axial technology, making it a noteworthy piece in the broader Speedmaster lineage.