Seiko Cal. 5691 - 163

The Seiko 5691-163 represents an important milestone in Seiko's 1971 lineup. Powered by the 5691 caliber with 30j jewels beating at 36,000 bph, it delivers a 61 hours power reserve. [seikata-wm-e7c5d56987e3]

Also known as: Monster, Helmet

Specifications

Movement

Solar

Case Material

Gold-Plated

Case Width

38mm

Case Thickness

13.5mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

White

Jewels

30j

Frequency

36,000 bph

Power Reserve

61 hours

Year

1971

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