Seiko Cal. 6638 - 690

The Seiko 6638-690 represents an important milestone in Seiko's 1995 lineup. Powered by the 6638 caliber with 20j jewels beating at 21,600 bph, it delivers a 72 hours power reserve. [seikata-wm-5c7005653cd8]

Also known as: Turtle, Samurai

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

37mm

Case Thickness

9.9mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Navy

Jewels

20j

Frequency

21,600 bph

Power Reserve

72 hours

Year

1995

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