Seiko Cal. 6641 - 331

The Seiko 6641-331 represents an important milestone in Seiko's 1991 lineup. The Bidirectional bezel and 44mm case give it a distinctive presence on the wrist. [seikata-wm-2e08a556fc3e]

Also known as: Sumo, Sportsmatic

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

44mm

Case Thickness

9.1mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Green

Jewels

26j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1991

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