Seiko Cal. 6638 - 997

The Seiko 6638-997 represents an important milestone in Seiko's 1970 lineup. Powered by the 6638 caliber with 30j jewels beating at 28,800 bph, it delivers a 61 hours power reserve. [seikata-wm-72f145a8efac]

Also known as: Pogue, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

45mm

Case Thickness

14.0mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

200m

Dial Color

White

Jewels

30j

Frequency

28,800 bph

Power Reserve

61 hours

Year

1970

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