Seiko Cal. 6639 - 937

The 6639-937 is a sought-after Quartz piece from Seiko's golden era. Powered by the 6639 caliber with 21j jewels beating at 36,000 bph, it delivers a 47 hours power reserve. [seikata-wm-6ba2e455d286]

Also known as: Turtle, World Timer

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

38mm

Case Thickness

12.4mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

60m

Dial Color

Champagne

Jewels

21j

Frequency

36,000 bph

Power Reserve

47 hours

Year

1989

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