Antique Long Leaf Brooch Mystery Markings Early Clasp

My favorite mysteries? When no one gets murdered, and there is jewelry involved !! This gold brooch has no stampings, just what looks like initials engraved/carved into the reverse. It’s 2 1/2” long. Dating this piece via the very early safety clasp, ca. 1900 to 1920’s. Art nouveau nature theme Metal content unknown.