Seiko Cal. 6657 - 397

The 6657-397 is a sought-after Spring Drive piece from Seiko's golden era. It features a White dial protected by a Acrylic crystal and offers 140m of water resistance. [seikata-wm-29fe85060a7d]

Also known as: Rally, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

14.0mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

140m

Dial Color

White

Jewels

29j

Frequency

28,800 bph

Power Reserve

56 hours

Year

1977

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