| DATING GUIDE TO DALLMEYER LENSES | |||
| 1881 | 30000-31000 | ||
| 1862 | 5000 | 1882 | 31000-33000 |
| 1863 | 6000 | 1883 | 33000-34000 |
| 1864 | 7000-8000 | 1884 | 34000-35000 |
| 1865 | 9000-11000 | 1885 | 36000-37000 |
| 1866 | 12000 | 1886 | 38000-40000 |
| 1867 | 13000 | 1887 | 41000 |
| 1868 | 14000-15000 | 1888 | 42000-43000 |
| 1869 | 16000-17000 | 1889 | 44000-46000 |
| 1870 | 18000 | 1890 | 47000-48000 |
| 1871 | 19000-20000 | 1891 | 49000-50000 |
| 1872 | 20000 | 1892 | 51000-52000 |
| 1873 | 21000 | 1893 | 52000-53000 |
| 1874 | 22000-23000 | 1894 | 54000 |
| 1875 | 23000-25000 | 1895 | 55000 |
| 1876 | 25000-26000 | 1896 | 56000 |
| 1877 | 26000-27000 | 1897 | 57000 |
| 1878 | 27000-28000 | 1898 | 58000 |
| 1879 | 28000-29000 | 1899 | 59000 |
| 1880 | 29000-30000 | 1900 | 60000-62000 |
| ROSS BRASS LENS FLANGES | |||||||
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