This is how the catalog for the HR Harmer auction held October 26-27, 2022, described the item pictured in Figure 1: Green Bay M Ty 4...

The Post Office began to transport mail via plane, i.e., "airmail," as early as 1911, but official airmail service didn't commence until...

This cover from 1894 is beat up, but it has a neat train car-themed ad and a recipient who died of a pistol shot! It was mailed from...

This cover will not be found in the Scott catalog (if it were, it would definitely be a "back of book" item), but it was a step in the...

As a stamp collector, it's fun to come upon correspondence between renown philatelists of the past. One such cover in my collection was...