Seiko Cal. 6638 - 578

Seiko 6638-578

The Seiko 6638-578 represents an important milestone in Seiko's 1971 lineup. The Rotating bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-c1c06bbad2ff]

Also known as: Samurai, Baby Tuna

Specifications

Movement
Automatic
Case Material
Two-Tone
Case Width
37mm
Case Thickness
9.8mm
Lug Width
18mm
Crystal
Hardlex
Bezel
Rotating
Water Resistance
100m
Dial Color
Burgundy
Jewels
34j
Frequency
36,000 bph
Power Reserve
69 hours
Year
1971

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