Seiko Cal. 6657 - 420

The Seiko 6657-420 represents an important milestone in Seiko's 1977 lineup. The Bidirectional bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-1e84ea44c9e8]

Also known as: Arnie

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

13.8mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Navy

Jewels

32j

Frequency

36,000 bph

Power Reserve

71 hours

Year

1977

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