Seiko Cal. 6657 - 234

The Seiko 6657-234 represents an important milestone in Seiko's 1982 lineup. The Bidirectional bezel and 46mm case give it a distinctive presence on the wrist. [seikata-wm-7af606fd852e]

Also known as: Helmet

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

46mm

Case Thickness

14.7mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

180m

Dial Color

Blue Sunburst

Jewels

34j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1982

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