Seiko Cal. 6639 - 669

The Seiko 6639-669 represents an important milestone in Seiko's 1971 lineup. With its 18mm lug width and 8.2mm profile, it sits comfortably on most wrists. [seikata-wm-73c4a3df5625]

Also known as: Bellmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

8.2mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Silver

Jewels

25j

Frequency

21,600 bph

Power Reserve

39 hours

Year

1971

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