Seiko Cal. 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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