Seiko Cal. 6638 - 313

Seiko 6638-313

The Seiko 6638-313 represents an important milestone in Seiko's 1977 lineup. Powered by the 6638 caliber with 17j jewels beating at 21,600 bph, it delivers a 58 hours power reserve. [seikata-wm-62bc3e7cedc6]

Also known as: Goldfeather, Baby Tuna

Specifications

Movement
Hand-Winding
Case Material
Stainless Steel
Case Width
42mm
Case Thickness
14.7mm
Lug Width
19mm
Crystal
Acrylic
Bezel
Fixed
Water Resistance
60m
Dial Color
Green
Jewels
17j
Frequency
21,600 bph
Power Reserve
58 hours
Year
1977

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