Seiko Cal. 6631 - 746

This Automatic model from 1977 features a 38mm Two-Tone case. Powered by the 6631 caliber with 25j jewels beating at 28,800 bph, it delivers a 38 hours power reserve. [seikata-wm-1e1f6cc0588a]

Also known as: Arnie

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

38mm

Case Thickness

15.5mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Green

Jewels

25j

Frequency

28,800 bph

Power Reserve

38 hours

Year

1977

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