Seiko Cal. 5666 - 561

The Seiko 5666-561 represents an important milestone in Seiko's 1968 lineup. Powered by the 5666 caliber with 19j jewels beating at 21,600 bph, it delivers a 64 hours power reserve. [seikata-wm-4befa04ed194]

Also known as: Bullhead

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

12.9mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

100m

Dial Color

Navy

Jewels

19j

Frequency

21,600 bph

Power Reserve

64 hours

Year

1968

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