Seiko Cal. 6638 - 335

Seiko 6638-335

The 6638-335 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6638 caliber with 34j jewels beating at 36,000 bph, it delivers a 67 hours power reserve. [seikata-wm-55eb78b58c7e]

Also known as: Turtle, Sportsmatic

Specifications

Movement
Spring Drive
Case Material
Gold-Plated
Case Width
40mm
Case Thickness
9.2mm
Lug Width
19mm
Crystal
Acrylic
Bezel
Rotating
Water Resistance
80m
Dial Color
Cream
Jewels
34j
Frequency
36,000 bph
Power Reserve
67 hours
Year
1980

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