Seiko Cal. 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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