Seiko Cal. 6638 - 539

The 6638-539 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6638 caliber with 20j jewels beating at 28,800 bph, it delivers a 63 hours power reserve. [seikata-wm-0ff8bdedc5bd]

Also known as: Turtle

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

45mm

Case Thickness

14.4mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

70m

Dial Color

Burgundy

Jewels

20j

Frequency

28,800 bph

Power Reserve

63 hours

Year

1996

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