Seiko Cal. 3863 - 521

The Seiko 3863-521 represents an important milestone in Seiko's 1975 lineup. Powered by the 3863 caliber with 20j jewels beating at 21,600 bph, it delivers a 69 hours power reserve. [seikata-wm-87c41af04891]

Also known as: World Timer

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

39mm

Case Thickness

10.1mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

30m

Dial Color

Green

Jewels

20j

Frequency

21,600 bph

Power Reserve

69 hours

Year

1975

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