Column dial by Henry Robert
1831-1870
1831-1870
1860
1836
1850-1856
1850-1859
1862
1845
1851
1876
1835-1870
1850-1859
1853
1867-1868
1845
1849
1855
1845
1875
1837
1852
1834
1832
1865
1858
1834
1848
1870
1834-1844
1837
1838
1866-1870
circa 1854
1850
circa 1854
1831
1870-1875
circa 1840
1850-1860
1872
1839
1843
1855
1875
1849
circa 1868
1850
1841
1837
1872 (original); 1909 (model)
1840-1851