Seiko Cal. 5631 - 661

The 5631-661 is a sought-after Spring Drive piece from Seiko's golden era. The Inner Rotating bezel and 34mm case give it a distinctive presence on the wrist. [seikata-wm-6fed6bfc30ad]

Also known as: Sea Horse, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

34mm

Case Thickness

13.2mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Silver

Jewels

34j

Frequency

36,000 bph

Power Reserve

66 hours

Year

1994

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