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Scanned stamp of horseshoe magnet with lines of attraction.

Caption: Pittsburgh: Offers Unexcelled Opportunities: No Tax on Machinery and Tools: Bring Your Plant to the Fuel: Ask the Chamber of Commerce.
Notes: One of a series of stamps issued by the Pittsburg Dispatch. Far left edge damaged; digitally repaired. Size: approximately 2" x 1.5" (5cm x 4cm).
Date: Approx. 1911-1922.
From the Collections of the Pennsylvania Department,
Carnegie Library of Pittsburgh.

Thumbnail: Scanned stamp of worker wielding 
sledge hammer (detail). Return to Index of Thumbnails.