Seiko Cal. 5660 - 903

The Seiko 5660-903 represents an important milestone in Seiko's 1969 lineup. Powered by the 5660 caliber with 36j jewels beating at 28,800 bph, it delivers a 64 hours power reserve. [seikata-wm-1bb7042e10b7]

Also known as: Tuna, Sea Horse

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

43mm

Case Thickness

10.5mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Champagne

Jewels

36j

Frequency

28,800 bph

Power Reserve

64 hours

Year

1969

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