Seiko Cal. 3813 - 636

Released in 1965, the Cal. 3813 with design code 636 was part of Seiko's domestic market collection. With its 21mm lug width and 10.6mm profile, it sits comfortably on most wrists. [seikata-wm-ad683fb290e4]

Also known as: Tuna

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

43mm

Case Thickness

10.6mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

160m

Dial Color

Black

Jewels

17j

Frequency

28,800 bph

Power Reserve

64 hours

Year

1965

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