Seiko Cal. 6638 - 377

Seiko 6638-377

The 6638-377 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 6638 caliber with 18j jewels beating at 28,800 bph, it delivers a 61 hours power reserve. [seikata-wm-1b01534f363f]

Also known as: Bullhead, Silverwave

Specifications

Movement
Kinetic
Case Material
Hardlex-Coated Steel
Case Width
45mm
Case Thickness
11.6mm
Lug Width
18mm
Crystal
Mineral
Bezel
Fixed
Water Resistance
80m
Dial Color
Black
Jewels
18j
Frequency
28,800 bph
Power Reserve
61 hours
Year
1997

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