Any issued in the U.S. since 1860 are valid to use on letters.
What are postage stamps?
To "wreck a pair" is to do this to 2 eggs.
What is to scramble?
During WWII, these tobacco products were used as "money" in many prisoner-of-war camps.
What are cigarettes?
James Hilton novel in which Mr. Ralston suggests that Mr. Chipping resign.
What is “Goodbye Mr. Chips”?
Its 1st digit identifies geographical area, & the 4th & 5th identify the post office.
What is the zip code?
"Whistle berries" refers to these Boston legumes.
What are baked beans?
U.S. dollar bills are 25% linen & 75% this fiber.
What is cotton?
Illustrator of Flowers & Fungi, she also wrote children's tales like "Peter Rabbit".
Who is Beatrix Potter?
Of AK, AL, or AS, the approved postal abbreviation for Alaska.
What is AK?
In the early days, a glass of this was "Adam's ale" or "Potomac phosphate".
What is water?
On the Kennedy half, it wears a shield; on the Susan B. Anthony dollar, it's landing on Moon.
What is the eagle?
H. Rider Haggard used this 3rd person singular pronoun as a title of 1887 novel.
What is “She”?
4th class mail, including merchandise, printed matter, & mailable live animals, is better known as this.
What is Retail Ground?
Number that Mel might have called out to say "We're all out of it".
What is 86?
In 1909 he became the first U.S. president ever to appear on a coin.
Who is Lincoln?
What you'll be if you accomplish all the ifs in Rudyard Kipling's "If", my son.
What is a man?
Black envelopes are nonmailable since this wouldn't be legible.
What is the postmark?
"Bossy in a bowl".
What is beef stew?
Rome’s first mint had this ancient Roman temple on it.
What is Juno Moneta?
Dickens novel in which Miss Havisham left everything in her house as it was the day she was jilted.
What is “Great Expectations”?