Seiko Cal. 6641 - 866

The Seiko 6641-866 represents an important milestone in Seiko's 1968 lineup. With its 18mm lug width and 15.1mm profile, it sits comfortably on most wrists. [seikata-wm-c34154effc85]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

40mm

Case Thickness

15.1mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Silver

Jewels

36j

Frequency

28,800 bph

Power Reserve

68 hours

Year

1968

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