Seiko Cal. 6657 - 307

Seiko 6657-307

The Seiko 6657-307 represents an important milestone in Seiko's 1971 lineup. Powered by the 6657 caliber with 25j jewels beating at 28,800 bph, it delivers a 51 hours power reserve. [seikata-wm-69fbb0b08b9d]

Also known as: Shogun, Silverwave

Specifications

Movement
Automatic
Case Material
Hardlex-Coated Steel
Case Width
35mm
Case Thickness
11.2mm
Lug Width
22mm
Crystal
Sapphire
Bezel
Fixed
Water Resistance
130m
Dial Color
Silver
Jewels
25j
Frequency
28,800 bph
Power Reserve
51 hours
Year
1971

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