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Roseville Olympic mark, Ca 1906 Beginning around 1910 the application of the blue Rv inkstamp became fairly common across many of the lines until 1928.

Several companies merged in 1911 to become Brush-McCoy Pottery Company, operating in Zanesville and Roseville.

Metlox and the Poppytrail name were sold to Evan K.

Day - Top of the diamond - this is self explanatory Month - Bottom of the diamond - this is worked out from the code below:- Year codes Year codes Year codes Year codes 1842 X 1855 E 1868 X 1881 E 1843 H 1856 L 1869 H 1882 L 1844 C 1857 K 1870 C 1883 K 1845 A 1858 B 1871 A 1846 I 1859 M 1872 I 1847 F 1860 Z 1873 F 1848 U 1861 R 1874 U 1849 S 1862 O 1875 S 1850 V 1863 G 1876 V 1851 P 1864 N 1877 P 1852 D 1865 W 1878 D 1853 Y 1866 Q 1879 Y 1854 J 1867 T 1880 J Exception Notes: In 1857 the letter R was used during 1-19 September, and during 1860 the letter K was used for December.

Poppy Trail denotes the Metlox pattern name.

Two quick ways of finding who made what you have are searching on eBay and Google.

It looks like Roqu Yally possibly.

This mark was used by the Jules Henriot factory in Quimper, France known for making faience pottery.

Other companies began manufacturing porcelain in the Capodimonte tradition after 1925.

The glazes in pottery went with fashion of the day, and trends can be noted, although there are lots of exceptions.