These two covers were sent from Baltimore, Maryland to the same address in Lowell, Massachusetts - "J.C. Ayer Co." - just one week apart...

This is a nice cover to highlight even though I have no clue who sent it. The cover has 2-cents worth of postage, which was the letter...

On January 1, 1893, the US Postal Service released its first-ever commemorative stamps, i.e., stamps issued to celebrate a specific event...

This advertising cover was sent from Milwaukee, Wisconsin to Greene, Maine sometime in the spring of 1895. In Figure 1, you can just make...

This advertising cover was sent on December 17, 1888, from Rochester, New York to Cobbleskill (or Cobleskill), New York, a small town...