OMEGA Speedmaster Calibre 321

The Omega Speedmaster Calibre 321, reference 311.93.42.30.99.001, has a 42mm platinum case paired with a ceramic bezel and a black dial. It is fitted with a leather strap and a sapphire crystal, and offers water resistance to 50 metres. The manual-winding Omega calibre 321 provides a 55 hour power reserve and drives the chronograph, tachymeter and small seconds functions, visible through a display back. A screw-down crown completes the case construction.