Omega Speedmaster ref. 3870.50.31 was made from 1996 to 2014 as the alligator-strap version of the classic Speedmaster Professional. It features a stainless steel case, a closed caseback, a hesalite crystal, and an alligator strap with a folding clasp.
Movement Type
Manual Chronograph
Caliber
1861Jewels
18
Reserve
48
Frequency
21600
Hands
Small Seconds
Shape
Round
Lug Distance
20.00 mm
Material
Stainless Steel
Glass
Plexi
Diameter
42.00 mm
Water Resistance
50.00 m
Dial Color
Black
