Mechanical Valentine in the Shape of a Dog, "A Token of Affection," circa 1925

The custom of sending messages of affection on February 14 dates back to Roman times, when mid-February was a time to meet and court prospective mates. The earliest American valentines were labors of love, handmade by the sender. The spread of commercially produced valentines in the second half of the nineteenth century made sending and receiving Valentine's Day cards a more lighthearted activity.