Seiko Cal. 6645 - 737

This Automatic model from 1981 features a 40mm Two-Tone case. Powered by the 6645 caliber with 20j jewels beating at 28,800 bph, it delivers a 37 hours power reserve. [seikata-wm-5bf98b208379]

Also known as: Crown

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

40mm

Case Thickness

12.7mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

130m

Dial Color

Black

Jewels

20j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1981

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