Reason slot meter, c.1920.
1918-1922
1918-1922
1919
1918
1921
1934
1923
1918
1922-1923
1922-1923
1922-1923
1922-1923
circa 1920
2000-100 BCE
1923
circa 1920
1920
1922
1955; 1830
1918-1920
1918
1921
1918
1923
1920
circa 1920
1920
1990-96
1920
circa 1920
1923
1934
1921
1919
1918
1930 (replica); 1834 (original)
1801-1892 (prepared); 1946 (element replaced)
1920
1922-1923
1922-1923
1920-1922
1922-1923
1922-1923
1922-1923
1922-1923
1922-1923
1923
1923
1923
circa 1919
1922