Seiko Cal. 6643 - 916

Seiko 6643-916

This Hand-Winding model from 1988 features a 45mm Two-Tone case. The Inner Rotating bezel and 45mm case give it a distinctive presence on the wrist. [seikata-wm-fa459e542e5a]

Also known as: Sportsmatic, World Timer

Specifications

Movement
Hand-Winding
Case Material
Two-Tone
Case Width
45mm
Case Thickness
9.5mm
Lug Width
19mm
Crystal
Sapphire
Bezel
Inner Rotating
Water Resistance
200m
Dial Color
Blue Sunburst
Jewels
18j
Frequency
36,000 bph
Power Reserve
51 hours
Year
1988

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