Alan Marion of Phoenix, Oregon, received a letter addressed to his great grandmother Florence - written more than 70 years ago.
The old mail arrived at a USPS office last July and a worker who noticed the unusual postage date went searching for Marion's family since Florence passed away almost 50 years ago.
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Man receives postcard 40 years later
UNIVERSITY PARK, MD - MARCH 7:
Michelle Leonardi, with one of two postcards postmarked 1946 and just delivered last week on March, 07, 2014 in University Park, MD.
(Photo by Bill O'Leary/The Washington Post via Getty Images)
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A elderly woman holds a postcard from a member of her familly written during WWI between 1914 and 1918, on November 13, 2013 in Strasbourg, eastern France, as part of a collection of pictures and items initiated by the French National Archives. AFP PHOTO/PATRICK HERTZOG (Photo credit should read PATRICK HERTZOG/AFP/Getty Images)
This picture taken on April 8, 2014 at the Museum of Letters and Manuscripts in Paris, shows French postcards edited during Wordl War I displayed as part of the exhibition 'Between the lines and the trenches', showing letters, notebooks and pictures from World War I . AFP PHOTO / FRANCK FIFE (Photo credit should read FRANCK FIFE/AFP/Getty Images)
Postcards bearing pictures of late popes John Paul II (Top) and John XXIII are on display on April 07, 2014 in Rome. Late popes John Paul II and John XXIII will be made saints at an unprecedented joint ceremony on April 27, 2014 in a bid to unite Catholic conservatives and liberals. The canonisations of two popular popes are set to bring hundreds of thousands of pilgrims to Rome. AFP PHOTO / GABRIEL BOUYS (Photo credit should read GABRIEL BOUYS/AFP/Getty Images)
AMARAPURA, MANDALAY REGION, MYANMAR - 2014/02/09: A man sells postcards in Amarapura. (Photo by Thierry Falise/LightRocket via Getty Images)
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A picture taken on November 13, 2013 in Strasbourg, eastern France, shows a postcard of soldiers posing during WWI between 1914 and 1918, as part of a collection of pictures and items initiated by the French National Archives. AFP PHOTO/PATRICK HERTZOG (Photo credit should read PATRICK HERTZOG/AFP/Getty Images)
A postcard from a inmate at the Auschwitz concentration camp dated May 13, 1942 is seen with a Hitler stamp, and a censor's red stamp, on display at the US National Postal Museum September 27, 2013, in Washington, DC. The popular museum is located opposite Union Station in Washington, DC, USA, and was established through joint agreement between the United States Postal Service and the Smithsonian Institution and opened in 1993. AFP PHOTO/Paul J. Richards (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)
Postcards showing a picture of a China Southern airlines Airbus A380 is seen on display in one of their offices in Shanghai on August 26, 2013. The Guangzhou-based carrier China Southern Airlines was expected to announce its half-year financial results later in the day. AFP PHOTO/Peter PARKS (Photo credit should read PETER PARKS/AFP/Getty Images)
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Alan received the letter last week and told the Mail Tribune, "Somebody's been looking over my shoulder here, and it must have been my great-grandmother."
The postal service still doesn't know what took so long for the letter to arrive - but it's not the first time a curious case like this has made headlines.
Last year, an Oklahoma mom received a letter from her son 46 years after he sent it. In it, he told his mom about how much fun he was having during a trip with his father and cousins.
And in Minnesota, a World War II-era postcard took 68 years to get delivered. It was penned by a naval trainee who served on the submarine USS Cuttlefish.