Seiko Cal. 5641 - 677

This Quartz model from 1978 features a 45mm Two-Tone case. The Fixed bezel and 45mm case give it a distinctive presence on the wrist. [seikata-wm-206fb8c7ba02]

Also known as: Sumo

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

45mm

Case Thickness

8.0mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

90m

Dial Color

Green

Jewels

25j

Frequency

21,600 bph

Power Reserve

72 hours

Year

1978

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