Seiko Cal. 3891 - 520

The Seiko 3891-520 represents an important milestone in Seiko's 1966 lineup. With its 19mm lug width and 10.9mm profile, it sits comfortably on most wrists. [seikata-wm-2d4e1ee1ab3f]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

41mm

Case Thickness

10.9mm

Lug Width

19mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

160m

Dial Color

Blue Sunburst

Jewels

34j

Frequency

36,000 bph

Power Reserve

41 hours

Year

1966

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