Seiko Cal. 6646 - 903

This Spring Drive model from 1974 features a 36mm PVD Black case. The Coin-Edge bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-2ceb4b339577]

Also known as: Golden Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

36mm

Case Thickness

14.0mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Navy

Jewels

18j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1974

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