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Serial Numbers:
Elgin
Hamilton
Illinois
South Bend
Waltham
Longines
Vacheron & Constantin
Illustrations:
Manual Wind Movement - Dial Side
Manual Wind Movement - Bridge Side
Chronograph Mechanism - Pillar Wheel Type
Chronograph Mechanism - Non-Pillar Wheel Type
Resources:
Resources for Identification
Watch Trademarks:
Watch Manufacturers Trade Marks
More:
Do Your Own Your Watch?
Swiss Brands with Restrictive Parts Policies
Horology Matters Yahoo Group
Exact Time from NIST