Seiko Cal. 5660 - 688

The Seiko 5660-688 represents an important milestone in Seiko's 1988 lineup. Powered by the 5660 caliber with 21j jewels beating at 21,600 bph, it delivers a 37 hours power reserve. [seikata-wm-ee367338c8f9]

Also known as: Arnie

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

38mm

Case Thickness

9.5mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

90m

Dial Color

Black

Jewels

21j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1988

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