Seiko Cal. 6645 - 646

The Seiko 6645-646 represents an important milestone in Seiko's 1987 lineup. Powered by the 6645 caliber with 26j jewels beating at 21,600 bph, it delivers a 54 hours power reserve. [seikata-wm-2867db9901d0]

Also known as: Crown

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

11.5mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

50m

Dial Color

Black

Jewels

26j

Frequency

21,600 bph

Power Reserve

54 hours

Year

1987

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