In the cramped cabin of the lunar module Eagle, after the first moonwalk, Buzz Aldrin noticed something on the floor. “I looked more closely, and my heart jumped,” he wrote in his autobiography. A broken circuit breaker lay in the dust—the very switch needed to arm the ascent engine that would carry him and Neil Armstrong off the surface. One of them had accidentally snapped it with a bulky life-support backpack. Without that single electrical pathway, the engine would remain dead, and the Moon would become a tomb. Aldrin surveyed the instrument panel, then remembered a felt-tip pen in his shoulder pocket. Its plastic tip, he reasoned, might just fit. He pushed it into the hole, the circuit activated, and the countdown to rendezvous with Michael Collins in orbit could begin.

The pen, a humble Duro Pen in brushed aluminium and plastic, sold at Sotheby’s in New York for roughly €750,000, together with the broken switch fragment. In the same auction house, a miniature Soviet flag—just 10 by 15 centimetres, carried by Aldrin aboard the command module Columbia—fetched $102,400, many times its pre-sale estimate. The flag bore his signature and a handwritten inscription: “Landed on the Moon on Apollo 11.” In a letter accompanying the lot, Aldrin explained that he had included the red banner as a gesture of goodwill, a quiet signal that the mission was “a human achievement, transcending national boundaries.” It was part of a long NASA tradition: astronauts routinely packed small flags of other nations, even geopolitical rivals, as tokens of international cooperation.

These two objects, a pen and a scrap of fabric, compress the grand narrative of Apollo 11 into something graspable. The mission was a triumph of colossal engineering—the Saturn V rocket, the lunar module, the global tracking network—but its most memorable moments often hinged on the improvised and the personal. The Soviet flag, tucked into a personal preference kit alongside a Texas flag and one from Aldrin’s home state of New Jersey, spoke to the Cold War context in which the space race unfolded. Viewed from Moscow, the gesture was a reminder that even as the superpowers competed, their astronauts could acknowledge a shared planetary endeavour. The pen, meanwhile, was never meant to be heroic; it was simply what an astronaut had on hand when a life-or-death problem presented itself.

The auction results reflect a durable fascination with the first lunar landing, an event watched by an estimated 1.9 billion people in 1969. The prices also underscore the rarity of such artefacts in private hands. The flight jackets of Armstrong and Collins reside in the Smithsonian; Aldrin’s own jacket sold for $2.77 million in 2022. The astronauts themselves took divergent paths after their return. Armstrong retreated from public life, teaching aerospace engineering and serving on corporate boards before his death in 2012. Collins became the first director of the National Air and Space Museum, shaping how the story would be told. Aldrin, now 96 and the sole survivor of that first descent, has remained a voluble advocate for Mars exploration, marrying for a fourth time at 93 and still writing his name across the memorabilia market.

What lingers is the image of that pen, its tip worn by the abrasive lunar dust, pushed into a broken switch to close a circuit that allowed two men to leave another world. Or perhaps it is the flag, folded small, that travelled 384,000 kilometres only to return and, decades later, be held up under an auctioneer’s gavel as proof that the Moon was not just a destination for national rivalry but a place where a simple plastic pen could rewrite the ending.