Seiko Cal. 6638 - 398

Seiko 6638-398

The 6638-398 is a sought-after Quartz piece from Seiko's golden era. Powered by the 6638 caliber with 17j jewels beating at 21,600 bph, it delivers a 48 hours power reserve. [seikata-wm-48d256bb275c]

Also known as: Tuna, Crown

Specifications

Movement
Quartz
Case Material
Stainless Steel
Case Width
38mm
Case Thickness
10.7mm
Lug Width
19mm
Crystal
Mineral
Bezel
Rotating
Water Resistance
120m
Dial Color
Black
Jewels
17j
Frequency
21,600 bph
Power Reserve
48 hours
Year
1972

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