Seiko Cal. 6640 - 424

Released in 1982, the Cal. 6640 with design code 424 was part of Seiko's domestic market collection. The Coin-Edge bezel and 34mm case give it a distinctive presence on the wrist. [seikata-wm-72f2cf0485ba]

Also known as: Sea Horse

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

34mm

Case Thickness

14.2mm

Lug Width

18mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Navy

Jewels

36j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1982

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