Seiko Cal. 6643 - 738

Seiko 6643-738

The 6643-738 is a sought-after Automatic piece from Seiko's golden era. The Inner Rotating bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-5ad628e03322]

Also known as: World Timer, Arnie

Specifications

Movement
Automatic
Case Material
Titanium
Case Width
36mm
Case Thickness
14.9mm
Lug Width
21mm
Crystal
Acrylic
Bezel
Inner Rotating
Water Resistance
40m
Dial Color
Navy
Jewels
29j
Frequency
36,000 bph
Power Reserve
48 hours
Year
1987

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