Honoring Montgomery Blair Block of Stamps

FIRST DAY OF ISSUE 1813 4883 HONORING Montgomery Blair Art Craft POSTMASTER GENERAL UNDER LINCOLN ORIGINATOR OF WHAT IS NOW THE UNIVERSAL POSTAL UNION 715 1st INTERNATIONAL POSTAL CONFERENCE 1st INTERNATIONAL POSTAL CONFERENCE 100th ANNIVERSARY 170ANNIVERSARY 15c MENSMERY BLAIR U.S.AIR MAIL 100th ANNIVERSARY MUNTGUMENT DLAIR U. 3. AIR MAIL CCCCCCCST DAY OF ISSUE 1 INTERNATIONAL POSTAL CONFERENCE 1st INTERNATIONAL POSTAL CUNFERENCE MONTGOMERY BLAIR U.S. AIR MAIL 15c 15 CCCC 100th ANNIVERSARY MONTGOMERY BLAIR U.S. AIR MAIL 15c