Seiko Cal. 6631 - 518

The Seiko 6631-518 represents an important milestone in Seiko's 1990 lineup. Powered by the 6631 caliber with 35j jewels beating at 21,600 bph, it delivers a 39 hours power reserve. [seikata-wm-c5820f339f15]

Also known as: Monster, Sea Horse

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

46mm

Case Thickness

8.7mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

100m

Dial Color

Cream

Jewels

35j

Frequency

21,600 bph

Power Reserve

39 hours

Year

1990

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