OMEGA Speedmaster Calibre 321

The Speedmaster Calibre 321, reference 311.90.42.30.99.002, is housed in a 42 mm platinum case with a ceramic bezel and a matching platinum bracelet. The black dial is paired with a sapphire crystal and a display back that reveals the manual-winding Omega calibre 321, offering a 55-hour power reserve. Chronograph and tachymeter functions are complemented by small seconds and a screw-down crown, with the case water resistant to 50 metres.