Experimental Form 1 (Licence to use Wireless Telegraph), 1905
1905
1905
2005
1855
1913
1908
1850-1859
1869
1869
2009
1906
1906
1890-1922
1944
1946
1943
1914
1897
1933
1924
1946
1924
2021
circa 2014
unknown
1875
1869
1869
1940-1949
1954
1875