This large desk was likely custom-built by Elidio Gonzales at the Taos Vocational School, which served as a New Deal furniture workshop, for use by the County Commission when meeting in the historic McKinley County Courthouse (a New Deal building). It was used for that purpose for decades, and at some point, panels with the Zia symbol from the state flag of New Mexico were added (the ones you see are not original to the piece).
