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Three gauges, tool for securing interchangeability in photographic lenses and two samples of same.
1892
1892
1880
1835-1865
1907
1907
1907
1907
1931-1940
1831-1930
1851-1930
1930-1960
1850-1920
1901-1950
circa 1910
1901-1918
1803-1876
1851-1930
1871-1900
circa 1850
1907
1907
1950
1950
1913-09-15
1964
circa 1867
circa 1890-1900
1930-1975
1925-1950
1907
1909
1840-1920
1917-06-18