Seiko Cal. 5680 - 638

The Seiko 5680-638 represents an important milestone in Seiko's 1978 lineup. Powered by the 5680 caliber with 26j jewels beating at 21,600 bph, it delivers a 64 hours power reserve. [seikata-wm-63cbb9a26541]

Also known as: Monster

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

38mm

Case Thickness

12.6mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Green

Jewels

26j

Frequency

21,600 bph

Power Reserve

64 hours

Year

1978

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