Seiko Cal. 6638 - 300

Seiko 6638-300

The 6638-300 is a sought-after Spring Drive piece from Seiko's golden era. The Rotating bezel and 45mm case give it a distinctive presence on the wrist. [seikata-wm-249045707cce]

Also known as: Bullhead, Sportsmatic

Specifications

Movement
Spring Drive
Case Material
Two-Tone
Case Width
45mm
Case Thickness
9.4mm
Lug Width
22mm
Crystal
Mineral
Bezel
Rotating
Water Resistance
100m
Dial Color
Green
Jewels
29j
Frequency
21,600 bph
Power Reserve
66 hours
Year
1969

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seikata-wm-249045707cce