Seiko Cal. 5663 - 381

The Seiko 5663-381 represents an important milestone in Seiko's 1977 lineup. Powered by the 5663 caliber with 31j jewels beating at 28,800 bph, it delivers a 61 hours power reserve. [seikata-wm-d096458b473e]

Also known as: Sea Horse

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

42mm

Case Thickness

10.8mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

180m

Dial Color

Blue Sunburst

Jewels

31j

Frequency

28,800 bph

Power Reserve

61 hours

Year

1977

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