![](https://coimages.sciencemuseumgroup.org.uk/445/310/large_thumbnail_smg00256512.jpg)
Copper foil with etched perforations at 20
1942-1943
1942-1943
1981
1945-1951
1956
1920-1930
circa 1960
1946
1868-1869
1954-1963
1914-1915
1916
1910-1930
1933-03
1935-01-25
1933-01-12
1914-1948
1933
1930
1926
1948-1951
1980
1780-1820
1933-01-12
1935-01-25
1950-1980
1947-1950
1939
1932
1933
1975-1982
1975
1981-1990
1921-1928
1965
1968-10
1972
1946 or later.
1957
1950-1965
1925-1983
2002-06-14
1968