Seiko Cal. 5663 - 528

The Seiko 5663-528 represents an important milestone in Seiko's 1981 lineup. It features a Black dial protected by a Mineral crystal and offers 50m of water resistance. [seikata-wm-646d8beeaee3]

Also known as: Sumo

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

44mm

Case Thickness

10.0mm

Lug Width

19mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

50m

Dial Color

Black

Jewels

20j

Frequency

36,000 bph

Power Reserve

62 hours

Year

1981

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