The George V Keyplate 1912 to 1931 Sixpence Value Sixpence Printings Plate Sheets Date Invoiced 1a 98 27 Sep 1912 1a 761 6 Dec 1912 10 509 11 May 1923 10 340 27 Sep 1923 11 500 17 Jun 1925 16 503 20 Mar 1928 18 498 17 Apr 1930