Seiko Cal. 5631 - 661

The 5631-661 is a sought-after Solar piece from Seiko's golden era. Powered by the 5631 caliber with 33j jewels beating at 28,800 bph, it delivers a 69 hours power reserve. [seikata-wm-fd5167e8a82a]

Also known as: Tuna, Flighty

Specifications

Movement

Solar

Case Material

Gold-Plated

Case Width

39mm

Case Thickness

11.1mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

White

Jewels

33j

Frequency

28,800 bph

Power Reserve

69 hours

Year

1982

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