Seiko Cal. 5660 - 999

The 5660-999 is a sought-after Automatic piece from Seiko's golden era. Powered by the 5660 caliber with 25j jewels beating at 36,000 bph, it delivers a 60 hours power reserve. [seikata-wm-bd821a684da0]

Also known as: Helmet, Sportsmatic

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

37mm

Case Thickness

13.3mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

White

Jewels

25j

Frequency

36,000 bph

Power Reserve

60 hours

Year

1989

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