Seiko Cal. 6663 - 631

The Seiko 6663-631 represents an important milestone in Seiko's 1987 lineup. The Coin-Edge bezel and 38mm case give it a distinctive presence on the wrist. [seikata-wm-aee8d1af16ea]

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

8.8mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Champagne

Jewels

17j

Frequency

21,600 bph

Power Reserve

57 hours

Year

1987

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