This is an early 20th century vintage trumeau mirror that is done in a mixture of revival style including Neoclassical, Victorian and Napoleon III (second Empire). A trumeau mirror is slim and tall and would have been placed between doors and/or windows. The decoration on yours is gilded molded gessoed plaster over with gilded tole or free hand scrolling acanthus, ribboned victory wreaths and scrolling cornucopias with dolphin ends. The fairly modern nails and cardboard backing are the tell for the date and age of this mirror. The estimate is based on actual recent past recorded auction sales of comparables. Retail 'asking prices' can be higher and vary.