Seiko Cal. 6641 - 491

The Seiko 6641-491 represents an important milestone in Seiko's 1965 lineup. The Rotating bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-d056de888cc0]

Also known as: Sumo, World Timer

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

40mm

Case Thickness

11.1mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

70m

Dial Color

Black

Jewels

34j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1965

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