Seiko Cal. 6657 - 730

Seiko 6657-730

The Seiko 6657-730 represents an important milestone in Seiko's 1981 lineup. Powered by the 6657 caliber with 19j jewels beating at 28,800 bph, it delivers a 47 hours power reserve. [seikata-wm-d7207b1ef64d]

Also known as: Helmet

Specifications

Movement
Kinetic
Case Material
Gold-Plated
Case Width
35mm
Case Thickness
11.9mm
Lug Width
19mm
Crystal
Sapphire
Bezel
Bidirectional
Water Resistance
80m
Dial Color
Burgundy
Jewels
19j
Frequency
28,800 bph
Power Reserve
47 hours
Year
1981

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