Seiko Cal. 3891 - 221

The Seiko 3891-221 represents an important milestone in Seiko's 1981 lineup. The Bidirectional bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-4d138fc1ab0c]

Also known as: World Timer, Baby Tuna

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

37mm

Case Thickness

10.8mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Navy

Jewels

20j

Frequency

21,600 bph

Power Reserve

63 hours

Year

1981

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