Seiko Cal. 6635 - 657

The Seiko 6635-657 represents an important milestone in Seiko's 1967 lineup. Powered by the 6635 caliber with 23j jewels beating at 21,600 bph, it delivers a 37 hours power reserve. [seikata-wm-b410a1903e55]

Also known as: Samurai, Silverwave

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

41mm

Case Thickness

13.2mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

150m

Dial Color

Black

Jewels

23j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1967

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