Experimental Form 1 (Licence to use Wireless Telegraph), 1905
1905
1905
2005
2021
circa 2014
circa 2014
unknown
circa 2014
circa 2014
1855
1850-1859
1946
1864
1890-1922
1933
1946
1924
1869
1913
1897
1869
1940-1949
1924
1869
1942
1886
1908
1914
1924
1944