Seiko Cal. 6638 - 722

The Seiko 6638-722 represents an important milestone in Seiko's 1976 lineup. Powered by the 6638 caliber with 28j jewels beating at 21,600 bph, it delivers a 41 hours power reserve. [seikata-wm-ed41f6712690]

Also known as: Samurai, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

34mm

Case Thickness

9.8mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

200m

Dial Color

Blue Sunburst

Jewels

28j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1976

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