The 1973 "Love" stamp is one of the most famous and influential stamp designs in US history. It features Robert Indiana's iconic pop art image, which he had first created as a painting in the mid-1960s. The design, with its bold, blocky letters and tilted "O," became a symbol of the "love generation." The stamp was issued in Philadelphia, a city whose nickname, "The City of Brotherly Love," made it the perfect location for the debut of this new stamp theme. The USPS initially released the stamp as a "special stamp for someone special," not as the start of a series. However, its immense popularity, with over 300 million sold, led to the creation of the "Love" series, which has continued with new designs almost every year. The stamp's simple yet powerful message resonated with the public, and it became a popular choice for wedding invitations, valentines, and everyday correspondence. The 1973 "Love" stamp is a landmark in American stamp design, demonstrating the power of a postage stamp to capture the cultural zeitgeist.