Seiko Cal. 6639 - 620

The Seiko 6639-620 represents an important milestone in Seiko's 1973 lineup. Powered by the 6639 caliber with 27j jewels beating at 28,800 bph, it delivers a 68 hours power reserve. [seikata-wm-69f38e68a3d8]

Also known as: Bellmatic

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

46mm

Case Thickness

8.9mm

Lug Width

20mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

180m

Dial Color

Cream

Jewels

27j

Frequency

28,800 bph

Power Reserve

68 hours

Year

1973

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