Omega Speedmaster 57 Co-Axial Chronograph 331.20.42.51.02.001 Two-Tone Full Set
Two-tone stainless steel and 18k yellow gold. Reference 331.20.42.51.02.001. No longer in production. Automatic caliber 9300. 60-hour power reserve. Silver dial, two subdials, date window at 6. Case 41.5mm.