Antique Mod-Louis Arm Chairs earlier seat and back has been modified by replacing it with a custom lucite resembling glass material. 
FYI: Lucite is higher grade acrylic plastic it is hard, water-resistant, and lightweight. Lucite was created in the mid 1800s and was finally patented and branded “Plexiglas” in 1933.
Material: Clear Lucite & Wood
One- of- A- Kind, 19th Century,