Seiko Cal. 6638 - 997

Seiko 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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