Seiko Cal. 6638 - 722

Seiko 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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seikata-wm-ed41f6712690