Speedmaster Professional REFERENCE
Steel on leather strap Reference: 3876.50.31
MOVEMENT
Caliber: Omega 1866 Manual−winding chronograph movement with rhodium−plated finish Power Reserve: 48 hours
CRYSTAL
Scratch−resistant sapphire crystal with anti−reflective treatment inside
CASE & DIAL
Stainless steel case diameter:42 mm Black dial
WATER RESISTANCE
Down to: 50 meters 167 feet
FEATURES
Chronograph Small seconds Moonphase Tachymeter Transparent case back