Seiko Cal. 6641 - 587

The Seiko 6641-587 represents an important milestone in Seiko's 1984 lineup. Powered by the 6641 caliber with 20j jewels beating at 21,600 bph, it delivers a 59 hours power reserve. [seikata-wm-30d79dd7b4a4]

Also known as: Helmet

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

41mm

Case Thickness

11.2mm

Lug Width

18mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

180m

Dial Color

Burgundy

Jewels

20j

Frequency

21,600 bph

Power Reserve

59 hours

Year

1984

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