Vintage Art Nouveau Folding Letter Opener

This elegant vintage Art Nouveau folding letter opener features a different design on each side of the case. Though it is not hallmarked, I believe the case is silver plated because silver polish worked on it. The blade is slightly out of true (see photo). Measurements: Folded, 3" x 1/2" (at widest). Unfolded: 5 & 3/8" long.