Omega 311.33.42.50.01.001 (Pre-owned - Good) — USD 8,670 on eBay

The Omega Speedmaster Co-Axial Chronograph reference 311.33.42.50.01.001 represents the brand's application of automatic movement technology to the Speedmaster platform. This reference belongs to the Co-Axial series, distinguishing it from manual-wind variants within the Speedmaster collection through its self-winding mechanism. The 42mm stainless steel case houses an automatic movement and features a black dial configuration. A sapphire crystal provides protection while a fixed tachymeter bezel maintains the chronograph's timing capabilities. Water resistance extends to 50 meters, suitable for everyday wear conditions. This reference appeals to collectors seeking automatic chronograph functionality within the Speedmaster family. The combination of 42mm proportions, stainless steel construction, and black dial execution positions this model as a contemporary interpretation that balances traditional chronograph utility with modern movement technology. The automatic caliber differentiates it from manual-wind alternatives in the same model range.