Seiko Cal. 6640 - 863

The Seiko 6640-863 represents an important milestone in Seiko's 1989 lineup. It features a Blue Sunburst dial protected by a Mineral crystal and offers 110m of water resistance. [seikata-wm-1f17ce899a2f]

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

36mm

Case Thickness

14.1mm

Lug Width

21mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

110m

Dial Color

Blue Sunburst

Jewels

25j

Frequency

28,800 bph

Power Reserve

41 hours

Year

1989

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