Picture frame - Copper - Art Nuveau Arts and Craft

Antique art nuveau table picture frame made of copper.
Ca. 1910-1920 made with a fold-up back to insert a picture or portrait.
Beautiful quality piece in style with the British Arts and Crafts movement, but likely an European made piece.
The piece is in very good condition, the hinges are slightly tight but otherwise a good piece in lovely condition, with a pleasing patina.