Seiko Cal. 6631 - 454

The Seiko 6631-454 represents an important milestone in Seiko's 1972 lineup. With its 22mm lug width and 8.9mm profile, it sits comfortably on most wrists. [seikata-wm-cfc7951a1e31]

Also known as: Bellmatic, Arnie

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

37mm

Case Thickness

8.9mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

40m

Dial Color

Silver

Jewels

34j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1972

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