Seiko Cal. 6646 - 668

This Spring Drive model from 1976 features a 46mm Two-Tone case. The Bidirectional bezel and 46mm case give it a distinctive presence on the wrist. [seikata-wm-94833aa750b7]

Also known as: Tuna, Emperor

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

46mm

Case Thickness

13.4mm

Lug Width

20mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

70m

Dial Color

Blue Sunburst

Jewels

22j

Frequency

36,000 bph

Power Reserve

63 hours

Year

1976

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