Seiko Cal. 5658 - 660

Released in 1966, the Cal. 5658 with design code 660 was part of Seiko's domestic market collection. Powered by the 5658 caliber with 21j jewels beating at 21,600 bph, it delivers a 44 hours power reserve. [seikata-wm-bf559b7f268c]

Also known as: Helmet, Emperor

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

35mm

Case Thickness

10.0mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Green

Jewels

21j

Frequency

21,600 bph

Power Reserve

44 hours

Year

1966

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