Seiko Cal. 5661 - 670

The 5661-670 is a sought-after Quartz piece from Seiko's golden era. Powered by the 5661 caliber with 27j jewels beating at 21,600 bph, it delivers a 45 hours power reserve. [seikata-wm-b072aec03eb8]

Also known as: Sumo

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

43mm

Case Thickness

12.5mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Green

Jewels

27j

Frequency

21,600 bph

Power Reserve

45 hours

Year

1967

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