Seiko Cal. 6631 - 564

This Spring Drive model from 1999 features a 34mm Two-Tone case. With its 19mm lug width and 9.0mm profile, it sits comfortably on most wrists. [seikata-wm-0b96e40e2c3a]

Also known as: Monster, Silverwave

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

34mm

Case Thickness

9.0mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

40m

Dial Color

Navy

Jewels

26j

Frequency

28,800 bph

Power Reserve

54 hours

Year

1999

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