First Day Covers
Postage stampsAAT: "Envelopes, postcards, or other postal items of reasonable size with a new stamp or stamps bearing the postally applied marking 'First Day of Issue' and indicating the date and place of first official issue."
AAT: "Envelopes, postcards, or other postal items of reasonable size with a new stamp or stamps bearing the postally applied marking 'First Day of Issue' and indicating the date and place of first official issue."
For more information, visit the Library website or email collections@mysticseaport.org