Seiko Cal. 6638 - 713

The 6638-713 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6638 caliber with 24j jewels beating at 36,000 bph, it delivers a 47 hours power reserve. [seikata-wm-4d715266146f]

Also known as: Turtle, Flighty

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

34mm

Case Thickness

9.3mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Navy

Jewels

24j

Frequency

36,000 bph

Power Reserve

47 hours

Year

1973

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