The number almost always appears on a California license plate, and is characteristic of the numbering scheme used by the California Department of Motor Vehicles, which began using the "1ABC123" numbering format for automobiles around the middle of 1980, replacing the exhausted "123 ABC" series.
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2GAT123 is a fictional license plate number that has appeared in a number of television shows and movies including L.A. Story (1991), Beverly Hills Cop II and Modern Family.