Seiko Cal. 6639 - 787

The Seiko 6639-787 represents an important milestone in Seiko's 1989 lineup. With its 22mm lug width and 15.6mm profile, it sits comfortably on most wrists. [seikata-wm-ae6ebf9699e6]

Also known as: Arnie

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

15.6mm

Lug Width

22mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

180m

Dial Color

Blue Sunburst

Jewels

21j

Frequency

36,000 bph

Power Reserve

62 hours

Year

1989

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