Seiko Cal. 6641 - 880

The Seiko 6641-880 represents an important milestone in Seiko's 1976 lineup. Powered by the 6641 caliber with 31j jewels beating at 28,800 bph, it delivers a 37 hours power reserve. [seikata-wm-063d02fafa21]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

39mm

Case Thickness

9.0mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Silver

Jewels

31j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1976

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