Seiko Cal. 3864 - 645

The Seiko 3864-645 represents an important milestone in Seiko's 1990 lineup. Powered by the 3864 caliber with 26j jewels beating at 21,600 bph, it delivers a 71 hours power reserve. [seikata-wm-618cce1816cb]

Also known as: Sea Horse, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

43mm

Case Thickness

9.8mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

160m

Dial Color

Green

Jewels

26j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1990

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