Seiko Cal. 5631 - 613

This Solar model from 1973 features a 38mm Titanium case. Powered by the 5631 caliber with 19j jewels beating at 28,800 bph, it delivers a 70 hours power reserve. [seikata-wm-9fb7584f02a7]

Also known as: Tuna, UFO

Specifications

Movement

Solar

Case Material

Titanium

Case Width

38mm

Case Thickness

11.2mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

190m

Dial Color

Blue Sunburst

Jewels

19j

Frequency

28,800 bph

Power Reserve

70 hours

Year

1973

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