Pairs were issued from 1911 until 1943, with singles from the 1944 decal until 1949 when in 1950 the pairs resumed. 1911 pairs are considered the most scarce.
1908-1910
1909 registration
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1911 (until june)
1911
1912
1913
1914
1915
1916
1917a
1917b
1918
1919 painted
1919
1920
1921 long
1921 medium
1921 short
1922 long
1922 medium
1922 short
1923 long
1923 medium
1923 short
1924 long
1924 short
1925 long
1925 short
1926 long
1926 short
1927
1928
1929
1930
1931
1932
1933
1934a
1934b
1934c
1935a
1935b
1936
1937a
1937b
1938
1939
1940
1941
1942
1943
1944 decal
1944 instructions
1945
1946
1947
1948-49undated
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1908-1910
1909 registration
1911 (until june)
1911
1912
1913
1914
1915
1916
1917a
1917b
1918
1919 painted
1919
1920
1921 long
1921 medium
1921 short
1922 long
1922 medium
1922 short
1923 long
1923 medium
1923 short
1924 long
1924 short
1925 long
1925 short
1926 long
1926 short
1927
1928
1929
1930
1931
1932
1933
1934a
1934b
1934c
1935a
1935b
1936
1937a
1937b
1938
1939
1940
1941
1942
1943
1944 decal
1944 instructions
1945
1946
1947
1948-49undated
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970