Antique Chinese Export, Art Nouveau style large Chinese filigree/mesh articulated enamel koi fish pendant, it probably dates to the early part of the 1900's. The workmanship on this handmade Koi fish pendant is extraordinary.  The filigree/mesh tail of the fish sways back-n-forth and is enameled in two shades.  A chain would hang from the jump ring. The fish is about 3 1/8" long and 1.5" wide at the widest point.