Seiko Cal. 5630 - 640

The Seiko 5630-640 represents an important milestone in Seiko's 1985 lineup. It features a Silver dial protected by a Acrylic crystal and offers 170m of water resistance. [seikata-wm-ca19bfe028d9]

Also known as: Sumo

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

15.3mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Silver

Jewels

27j

Frequency

28,800 bph

Power Reserve

43 hours

Year

1985

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