From the record
“The 1872 California-Nevada State Boundary Marker marks the initial point for the 1872 survey delineation of the state line between California and Nevada. The boundary marker is a small cast iron obelisk near Verdi, Nevada.”
Wikipedia article 1872 California-Nevada State Boundary Marker, CC BY-SA 4.0.
One of 83 National Register listings published here for Washoe County · listed in 1981 · category: Object.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service