Seiko Cal. 6366 - 643

The Seiko 6366-643 represents an important milestone in Seiko's 1970 lineup. The Fixed bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-5a7fed14de6e]

Also known as: Sumo

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

13.0mm

Lug Width

20mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

100m

Dial Color

Black

Jewels

23j

Frequency

21,600 bph

Power Reserve

55 hours

Year

1970

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