Seiko Cal. 6643 - 431

The Seiko 6643-431 represents an important milestone in Seiko's 1968 lineup. It features a Navy dial protected by a Acrylic crystal and offers 80m of water resistance. [seikata-wm-26af0fa14b5c]

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

42mm

Case Thickness

10.9mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

80m

Dial Color

Navy

Jewels

18j

Frequency

36,000 bph

Power Reserve

61 hours

Year

1968

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