Seiko Cal. 3820 - 646

The Seiko 3820-646 represents an important milestone in Seiko's 1989 lineup. With its 18mm lug width and 11.2mm profile, it sits comfortably on most wrists. [seikata-wm-6a5d3a1b81e1]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

34mm

Case Thickness

11.2mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

120m

Dial Color

Navy

Jewels

31j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1989

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