Seiko Cal. 5631 - 940

The 5631-940 is a sought-after Automatic piece from Seiko's golden era. With its 18mm lug width and 8.6mm profile, it sits comfortably on most wrists. [seikata-wm-513f4886c5ec]

Also known as: Rally, Navigator

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

41mm

Case Thickness

8.6mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Navy

Jewels

30j

Frequency

28,800 bph

Power Reserve

67 hours

Year

1971

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