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The 1957 Plymouth Belvedere Sport Coupe was buried on June 15, 1957 during Tulsarama!, a celebration commemorating the 50th anniversary of Oklahoma statehood. Some items buried with the gold and white car included: a 5 gallon can of gasoline, a jar of Oklahoma crude oil, fourteen bobby pins, a ladies compact plastic rain cap, several combs, a tube of lipstick, a pack of gum, facial tissues, 2.73 in bills and coins, a pack of cigarettes with a book of matches, an unpaid parking ticket, and a bottle of tranquilizers (items that may have been found in a woman's purse in 1957.) The car was located about 150 feet north of Sixth Street along Denver Avenue.
The car was unearthed on June 15, 2007, for the celebration of the 100th anniversary of Oklahoma, at Denver and 6th. The vault was compromised, and the car had extensive water damage; but the time capsule remained in tact. The winner of the car was Raymond E. Humbertson of Cumberland, MD (1921-1979) with the guess of 384,743 as the population of Tulsa in 2007. His guess was only off by 2,386 with the actual population being 382,457. In addition to the car, his heirs also received a savings account worth a little more than $700.
More information is available in the vertical file at the Central Library Research Center.
Sources: Tulsa Tribune, 6/05/67. Tulsa World, 6/15/97. Tulsa World, June 15, 2012, page A1. Tulsa World, June 23, 2007, page A1.