This is a 260-290 gram, rough cast ingot of 99.85% minimum purity Tin metal.
These ingots sometimes have a small spot of slag on them, you get a minimum of 260g of tin and almost all of them are around the 270+g mark. They are approximately 30x54 by 20mm in size, please see the photo with a scale in mm in it for an idea of size.
These are hand cast and hand stamped, see photo with a couple of examples for a good idea of the look of them, you get one out of the same stock. We can sell these in wholesale lots to resellers, message if you are interested.
Cast in Australia by B M&M.