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WWI Bob: 2-Cent U. S. Parcel Post Stamp
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WWI Bob: First World War Charity Seal
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WWI Bob: Closeup of Revenue Stamp Used for Postage Due
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WWI Bob: Example of Spray-On Cancellation
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WWI Bob: Postcard Mailed at Portsmouth, Virginia, Navy Yard, c.1919
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WWI Bob: Perfection Machine Cancellations
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WWI Bob: Cover with 'Night Service' Handstamp
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WWI Bob: Advertising Cover for Harley-Davidson Motorcycles
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WWI Bob: 4-Bar Handstamp of Warrenton, Oregon, from Spruce Soldier, 1918
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WWI Bob: War Work Donation Request -- Country Club
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WWI Bob: Postage Due Stamp Used to Pay Extra Cent
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WWI Bob: Fantasy Stamp Creation
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WWI Bob: U. S. Parcel Post Stamp, First World War Usage
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WWI Bob: Old Stamp on WW I Cover
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WWI Bob: Cancel From the Jamestown Exposition, Norfolk, Virginia, 1907
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WWI Bob: Parcel Post Stamp Used on Overseas Mail to Paris, France, 1913
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WWI Bob: Slogan Cancellation from Den Haag, Netherlands
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WWI Bob: Belgian Stamps Cancelled in Brussels
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WWI Bob: Certified Stamp
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WWI Bob: Rural Free Delivery (RFD) Handstamp
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WWI Bob: Forwarding Markings from Great Britain
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WWI Bob: Soldier's Letter from Europe with Postage Due
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WWI Bob: Postage Due Cover from Canada to the United States
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WWI Bob: Documentary Stamp Used as Postage Due
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WWI Bob: Parcel Tag from First World War
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WWI Bob: Foreign Destination Use of U. S. Parcel Post Stamp to France (1913)
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WWI Bob: Machine Cancel of the Model Post Office at the Panama-Pacific Exposition in San Francisco
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WWI Bob: Cancellation from Worlds Fair, Saint Louis, 1904
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WWI Bob: International Machine Cancel on Illegal Postcard Cutout
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WWI Bob: Self-Inking Counterstamp