Seiko Cal. 3872 - 681

The Seiko 3872-681 represents an important milestone in Seiko's 1971 lineup. Powered by the 3872 caliber with 29j jewels beating at 21,600 bph, it delivers a 55 hours power reserve. [seikata-wm-c6734ed73c54]

Also known as: Tuna

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

43mm

Case Thickness

12.8mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

70m

Dial Color

Blue Sunburst

Jewels

29j

Frequency

21,600 bph

Power Reserve

55 hours

Year

1971

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