Seiko Cal. 5663 - 371

The Seiko 5663-371 represents an important milestone in Seiko's 1987 lineup. The Inner Rotating bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-58ade0dbb2cf]

Also known as: Sea Horse, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

39mm

Case Thickness

8.1mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

80m

Dial Color

Silver

Jewels

36j

Frequency

28,800 bph

Power Reserve

49 hours

Year

1987

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