The Omega Speedmaster 3520.53.00, known as the Mark 40, has a 39mm case containing the self-winding caliber 1151. The grey dial features Arabic numerals and a distinctive day-night subdial at 9 o'clock.
Movement Type
Automatic Chronograph
Caliber
1151Jewels
25
Reserve
42
Frequency
28800
Hands
Small Seconds
Shape
Round
Lug Distance
18.00 mm
Material
Stainless Steel
Glass
Sapphire
Diameter
39.00 mm
Water Resistance
50.00 m
Dial Color
Grey
Material
Bracelet
