Seiko Cal. 6639 - 353

The Seiko 6639-353 represents an important milestone in Seiko's 1976 lineup. Powered by the 6639 caliber with 30j jewels beating at 36,000 bph, it delivers a 60 hours power reserve. [seikata-wm-8bed4fd59626]

Also known as: Sumo

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

9.3mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Blue Sunburst

Jewels

30j

Frequency

36,000 bph

Power Reserve

60 hours

Year

1976

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