Seiko Cal. 6639 - 581

The Seiko 6639-581 represents an important milestone in Seiko's 1997 lineup. Powered by the 6639 caliber with 30j jewels beating at 36,000 bph, it delivers a 46 hours power reserve. [seikata-wm-cd54fa8b4421]

Also known as: Bullhead, Helmet

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

44mm

Case Thickness

8.5mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

60m

Dial Color

White

Jewels

30j

Frequency

36,000 bph

Power Reserve

46 hours

Year

1997

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