Seiko Cal. 5633 - 520

The Seiko 5633-520 represents an important milestone in Seiko's 1971 lineup. The Bidirectional bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-de5bd19d8bf0]

Also known as: Turtle, Sea Horse

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

10.2mm

Lug Width

20mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Blue Sunburst

Jewels

24j

Frequency

28,800 bph

Power Reserve

51 hours

Year

1971

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