Seiko Cal. 5631 - 183

The 5631-183 is a sought-after Hand-Winding piece from Seiko's golden era. With its 18mm lug width and 12.1mm profile, it sits comfortably on most wrists. [seikata-wm-ee8729067ecc]

Also known as: Navigator, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

43mm

Case Thickness

12.1mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

30m

Dial Color

Green

Jewels

26j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1984

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