Seiko Cal. 5660 - 880

This Spring Drive model from 1971 features a 36mm Titanium case. Powered by the 5660 caliber with 20j jewels beating at 28,800 bph, it delivers a 71 hours power reserve. [seikata-wm-d417d1bdc953]

Also known as: Bullhead, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

36mm

Case Thickness

8.6mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

80m

Dial Color

Navy

Jewels

20j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1971

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