Five wooden molecular model balls
circa 1810
circa 1810
circa 1856
1825
1875-1885
1861
1855-1865
1845-1855
1830
1895-1900
1860
1870-1900
1890-1895
1835
1865-1875
1855-1865
circa 1830
1905-1915
1845-1855
1850-1860
1910-1920
1855-1865
1880-1900
1855-1860
1835-1845
1880-1900
circa 1835
1895-1905
1910-1915
circa 1820
1900
1870-1880
1910-1950
1912
1905-1915
1895-1905
1892-1895
1844
1845
circa 1820
1900
circa 1820
1835-1845
1900