Interesting ... Hard to tell for certain, but, it appears to have been cast from a mold. Knowing in what area of the world it was found may help identify. Was it dug?, found in a stream or lake?, found in an old dwelling? a family heirloom? ... aside from silver, neither pewter, or lead attracts a magnet, either. Were it Early Medieval & made of silver, one may expect a bit of patina/corrosion, especially if copper were mixed in. You could have a coin shop or jeweler determine whether it's silver, or, not. Please share some info concerning it's discovery.