Seiko Cal. 3817 - 631

This Hand-Winding model from 1966 features a 44mm PVD Black case. With its 19mm lug width and 15.6mm profile, it sits comfortably on most wrists. [seikata-wm-5e0cc2d1edfe]

Also known as: Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

44mm

Case Thickness

15.6mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

160m

Dial Color

Navy

Jewels

29j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1966

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