Seiko Cal. 6638 - 603

The Seiko 6638-603 represents an important milestone in Seiko's 1978 lineup. Powered by the 6638 caliber with 32j jewels beating at 21,600 bph, it delivers a 44 hours power reserve. [seikata-wm-ef0ce25366b6]

Also known as: Turtle, World Timer

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

38mm

Case Thickness

9.0mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

160m

Dial Color

Cream

Jewels

32j

Frequency

21,600 bph

Power Reserve

44 hours

Year

1978

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