Seiko Cal. 6641 - 668

The Seiko 6641-668 represents an important milestone in Seiko's 1969 lineup. With its 18mm lug width and 11.7mm profile, it sits comfortably on most wrists. [seikata-wm-fb12ba67dbcf]

Also known as: Sumo, Tuna

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

45mm

Case Thickness

11.7mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

60m

Dial Color

White

Jewels

33j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1969

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