Seiko Cal. 6638 - 748

The 6638-748 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6638 caliber with 31j jewels beating at 28,800 bph, it delivers a 58 hours power reserve. [seikata-wm-c0a8725c0a42]

Also known as: Turtle

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

34mm

Case Thickness

8.9mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Cream

Jewels

31j

Frequency

28,800 bph

Power Reserve

58 hours

Year

1981

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