Seiko Cal. 6643 - 957

Seiko 6643-957

The Seiko 6643-957 represents an important milestone in Seiko's 1971 lineup. Powered by the 6643 caliber with 27j jewels beating at 28,800 bph, it delivers a 43 hours power reserve. [seikata-wm-4438015dfefc]

Also known as: Helmet, Silverwave

Specifications

Movement
Automatic
Case Material
Two-Tone
Case Width
35mm
Case Thickness
13.3mm
Lug Width
20mm
Crystal
Hardlex
Bezel
Inner Rotating
Water Resistance
170m
Dial Color
Green
Jewels
27j
Frequency
28,800 bph
Power Reserve
43 hours
Year
1971

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