Seiko Cal. 5631 - 714

This Spring Drive model from 1970 features a 38mm PVD Black case. Powered by the 5631 caliber with 18j jewels beating at 28,800 bph, it delivers a 72 hours power reserve. [seikata-wm-7fec216e0fa5]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

38mm

Case Thickness

13.1mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

190m

Dial Color

Champagne

Jewels

18j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1970

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