Seiko Cal. 6631 - 405

The Seiko 6631-405 represents an important milestone in Seiko's 1998 lineup. Powered by the 6631 caliber with 33j jewels beating at 36,000 bph, it delivers a 51 hours power reserve. [seikata-wm-1b0750c3c62b]

Also known as: World Timer

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

41mm

Case Thickness

12.0mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

60m

Dial Color

Silver

Jewels

33j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1998

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