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WWI Bob: Inverted Dial (kinda)
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WWI Bob: Customs Mark from the First World War
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WWI Bob: First World War Postcard from the Military Academy at West Point, New York
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WWI Bob: Censored in 1919
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WWI Bob: Tilton "Late Train" Machine Marking
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WWI Bob: International Machine Slogan Cancellation
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WWI Bob: RPO to Denmark
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WWI Bob: Wesson Handstamp
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WWI Bob: RFD Manuscript Cancellation
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WWI Bob: Postcard Mailed at the Alaska-Yukon Exposition, Seattle, Washington, 1909
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WWI Bob: Registered Letter
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WWI Bob: Columbia Machine Marking
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WWI Bob: Civilian Patriotic Cover From 1917
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WWI Bob: Self-Inking Counterstamp
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WWI Bob: Newer Spray-on Postmark From the United States
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WWI Bob: U. S. "Mailers Postmark"
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WWI Bob: French Postmark and Stamps
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WWI Bob: Soldier's Letter from Europe with Postage Due
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WWI Bob: Odd Fellows Cover From Camp Devens
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WWI Bob: Postmark Used to Identify Mail Received From American Soldiers in France
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WWI Bob: International Machine Cancel on Illegal Postcard Cutout
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WWI Bob: Handstamp of Honolulu, Hawaii, 1890
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WWI Bob: Envelope Sent to Fort Sam Houston With Interesting Handstamp
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WWI Bob: Handstamp of Fort McKinley, Philippine Islands, 1917
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WWI Bob: Anti-War Cornercard from WW I
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WWI Bob: Liberty Bond Slogan Cancel
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WWI Bob: Cancel and Censor Mark on Card from Fort McKinley, Philippines
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WWI Bob: Post-WWI Cover to Soldier in NYC
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WWI Bob: Picture Postcard Folder Mailed from Camp Funston, Kansas
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WWI Bob: Collection and Distribution Wagon, Buffalo, New York