Coin Rings Size T To Z+6 British Half Crown Coin Rings. Most years available from 1947 to 1967, All can be resized. They currently retain their natural patina but can be highly polished if desired. As with all.my base metal rings these have been treated and sealed with several layers of a hard lacquer which will help to keep the ring in tip top condition and avoid the finger staining that can happen with base metal jewellery. Should you have any questions please don't hesitate to contact me, and please take a moment to read my exellent feedback and look at my other items, thank you. Dispatched with Royal Mail 1st Class Large Letter.