We recently found what we believe to be an etching entitled "Willow Trees" by Paul Emile Lecomte. It is stamped "Genuine Etching", The Paris Etching Society. The signature and title appears to be in pencil. After researching the SZL mark, we find it hard to imagine that this is a print. Could you please enlighten us as to the vintage and value of this beautiful 31x28" framed and matted "picture".