Seiko Cal. 3831 - 615

The Seiko 3831-615 represents an important milestone in Seiko's 1968 lineup. With its 21mm lug width and 12.1mm profile, it sits comfortably on most wrists. [seikata-wm-cba2e743ddd4]

Also known as: Tuna

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

41mm

Case Thickness

12.1mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

Champagne

Jewels

21j

Frequency

28,800 bph

Power Reserve

60 hours

Year

1968

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