Seiko Cal. 6645 - 987

The Seiko 6645-987 represents an important milestone in Seiko's 1981 lineup. Powered by the 6645 caliber with 26j jewels beating at 28,800 bph, it delivers a 43 hours power reserve. [seikata-wm-58f4cf1c894c]

Also known as: Crown

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

38mm

Case Thickness

11.4mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

White

Jewels

26j

Frequency

28,800 bph

Power Reserve

43 hours

Year

1981

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