Seiko Cal. 6640 - 659

The Seiko 6640-659 represents an important milestone in Seiko's 1996 lineup. It features a Cream dial protected by a Mineral crystal and offers 110m of water resistance. [seikata-wm-8c6392f10896]

Also known as: Sportsmatic, Sea Horse

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

14.4mm

Lug Width

21mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

110m

Dial Color

Cream

Jewels

25j

Frequency

21,600 bph

Power Reserve

59 hours

Year

1996

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