This official First Day Cover (FDC) was issued on June 28, 1972, commemorating the 55th Lions International Convention held in Mexico City. The cachet, printed in red, highlights the dates of the convention (June 28 – July 1, 1972) and marks the organization’s 55th anniversary (1917–1972). It features the 40 centavos commemorative stamp, showing the Lions International emblem, tied with a first-day cancellation reading “Día de Emisión – Correos México”. A philatelically significant piece, it reflects Mexico’s role as host nation for this major international humanitarian gathering. Collectors value it for both its thematic connection to service organizations and as a Latin American FDC of the early 1970s.