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