![](https://coimages.sciencemuseumgroup.org.uk/1/477/large_thumbnail_a196851.jpg)
Set of 12 trial lenses and a pair of trial frames, Europe, 1880-1920
1880-1920
1880-1920
1850-1914
1850-1914
1850-1914
1850-1914
1850-1914
1700-1800
1840-1920
1880-1920
1850-1914
1880-1920
1880-1920
1850-1914
1850-1900
1891-1930
1840-1870
1891-1930
1891-1910
1850-1925
1850-1925
1850-1914
1850-1920
1891-1930
1891-1930
1891-1930
1891-1940
1891-1940
1891-1940
1891-1930
1891-1940
1880-1910
1891-1940
1880-1910
1891-1940
1891-1940
1880-1930
1870-1920
1870-1930
1870-1930
1870-1930
1820-1900
1870-1930
1870-1930
1850-1914
1850-1914
1870-1930
1870-1930
1850-1914
1790-1920