Seiko Cal. 6635 - 647

The Seiko 6635-647 represents an important milestone in Seiko's 1988 lineup. It features a Black dial protected by a Mineral crystal and offers 190m of water resistance. [seikata-wm-ea2fd9a3c133]

Also known as: Bellmatic, Sea Horse

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

39mm

Case Thickness

15.5mm

Lug Width

21mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

190m

Dial Color

Black

Jewels

32j

Frequency

21,600 bph

Power Reserve

54 hours

Year

1988

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