Advertising cover, postmarked 1902. Henry Bishop, known as "Bishop The Bird Man," was an interesting character, who operated a pet business out of Baltimore.
He published one or more catalogs of cage birds, and several graphic ad covers. He also sold safe, sanitary pet foods, such as "Bishop's Bird Dainties", "Parrot Seed"
and "Mocking-Bird Food". (see the book Pets In America by Katherine C. Grier) This cover is of postal interest because it highlights Bishop's use of the U.S. mails
to promote, market and deliver his goods, and the implication that his products were endorsed by Uncle Sam.