When s the next mega grading results 1817 half crown and 1911 proof half sovereign

NGC MS-63.1818, Great Britain, George III. Obverse Laureate head of George III right. Legend GEORGIUS III DEI GRATIA 1818 Transation. 917 Diameter 19.2mm Weight 3.99gm. 1818, great britain, george iii. beautiful gold ½ sovereign coin. ngc ms-63 this item can be shipped worldwide.