Dug these objects primarily in the swales and parking strips in the area around my dad's house in Miami Fl, not far from the Miami River. I just walked out the front door and started detecting along the streets and sidewalks. I picked up 32 wheats, a '41 Merc and a '64 Rosie, and this strange object. It is made of lead; however, the color of the surface is this buffy gray clay color, and I've never seen lead take on surface characteristics like this from oxidation. I've seen it turn gray, white, and black, but never a clay color; it could be a coating of some sort, paint, possibly, though what sort of paint would stick so well to the paint and maintain its smooth, almost polished surface without getting powdery or chalky or else flaking after many years in the ground presumably, I'm not sure. BTW, the soil around the object was not clay, it was sandy with some organic matter, kind of gray.
As you can see, it is marked "MIAMI". A hole runs through the center from end to end. I think it's a fishing weight, but the surface color (coating?) and the shape and the "miami" cast lettering, are all new to me, and I've seen a lot of fishing weights in Miami, been fishing here for the last 50 years. I've never seen a weight imprinted with the Miami name.