Seiko Cal. 6631 - 541

The Seiko 6631-541 represents an important milestone in Seiko's 1985 lineup. The Fixed bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-be75ac669c26]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

8.2mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

110m

Dial Color

White

Jewels

33j

Frequency

36,000 bph

Power Reserve

57 hours

Year

1985

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