Seiko Cal. 5631 - 601

The 5631-601 is a sought-after Automatic piece from Seiko's golden era. Powered by the 5631 caliber with 32j jewels beating at 21,600 bph, it delivers a 47 hours power reserve. [seikata-wm-a88a8c927340]

Also known as: Tuna, Golden Tuna

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

11.0mm

Lug Width

21mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

60m

Dial Color

Cream

Jewels

32j

Frequency

21,600 bph

Power Reserve

47 hours

Year

1978

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