Seiko Cal. 5657 - 903

The Seiko 5657-903 represents an important milestone in Seiko's 1971 lineup. It features a Green dial protected by a Acrylic crystal and offers 160m of water resistance. [seikata-wm-0c443b9f8257]

Also known as: UFO, Sportsmatic

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

46mm

Case Thickness

13.2mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

160m

Dial Color

Green

Jewels

28j

Frequency

28,800 bph

Power Reserve

61 hours

Year

1971

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