Since USPS issued the first Love stamp 50 years ago, in 1973, it’s been one of the most beloved, and best-selling. Subscribe to the Design newsletter.

The stamp bears one of St. Teresa of Calcutta’s famous sayings: “Not all of us can do great things. But we can do small things with great love.” ...

The shirts say Made With Love at the Center of Family Love. “It gives them a fun activity to do,” says Averyt. “as well as generating a fundraiser for the future.” ...

Not so with Love. “I say a stamp collection doesn’t always have to stay in a closet,” says Love, an adjunct professor of Christian education at Hood Theological Seminary.