For philatelists and students of postal history out there, here's a first-day cover to mark the opening of the Dover Municipal Airport, Sept. 16-17, 1933. Due to bad weather, however, the actual ceremony was delayed until Sept. 23. The original hangar once housed the offices of the Dover Post. The cover was addressed to Harry Stoddard Nichols of Utica, N.Y.

Dover turns 300 this year. A new photo every Thursday.