Tinned steel chocolate mold... I believe this is a 20th century vintage reproduction of an antique candy mold. It's not marked that I could find.
This little bunny measures 4 1/4" tall, mold framing is a little larger. Has no clips to hold it together, just front and back as shown. The tinning is darkened and a little worn, but with very few light rust spots. Probably fine for food, or as a candle mold, or just for display!