Seiko Cal. 6638 - 670

Released in 1965, the Cal. 6638 with design code 670 was part of Seiko's domestic market collection. The Fixed bezel and 45mm case give it a distinctive presence on the wrist. [seikata-wm-ac1af2a7c07c]

Also known as: World Timer, Crown

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

45mm

Case Thickness

8.4mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

110m

Dial Color

Black

Jewels

20j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1965

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