The Corum Admiral's Cup model (Reference Number: 01.0045), often known by its full name, the Challenge 48 Black Flag, is a large luxury sports watch inspired by the world of sailing competitions and produced in a limited edition. Key Technical Specifications • Case Size: 48 mm in diameter, with a robust thickness and iconic dodecagonal (12-sided) shape. • Material: Ultra-lightweight, high-strength titanium combined with carbon inserts on the bezel. • Movement: Automatic, caliber CO753 (based on the extremely reliable ETA 7753 movement). • Functions: Chronograph (with bi-compax/tri-compax sub-dials) and date display. • Water Resistance: 30 ATM (300 meters), fully protected for water activities. • Dial: Matte black (stealth), subtly decorated along the edge with the famous monochrome nautical flags, characteristic of the Corum collection’s identity