Antique Chicken Chocolate Mold with Key, Two Pieces Hinged

Chicken chocolate mold with a key, two pieces hinged.  There were many German companies that made chocolate molds, but I haven't been able to find a name on the mold.  The mold is probably from the 1900's to 1920's, stands 5" x 5.5".  It's very worn on the outside, with scratches, metal wear, and a small amount of rust on the edges.  Inside is in better condition. .  It's very charming and highly collectible, just right for a vintage home decor'.