Seiko Cal. 6657 - 400

The 6657-400 is a sought-after Solar piece from Seiko's golden era. Powered by the 6657 caliber with 25j jewels beating at 36,000 bph, it delivers a 38 hours power reserve. [seikata-wm-137b8e608f2e]

Also known as: Sumo

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

10.6mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Black

Jewels

25j

Frequency

36,000 bph

Power Reserve

38 hours

Year

1983

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