The maker is Ridgways, Bedford Works, Shelton, Hanley. The bow and quiver backstamp was first used in 1880 and the Semi China diamond is believed to have been first used about 1912. Both appeared in various forms over the years. Your backstamps sound like an early combination as 2 over 08 is probably the code for date of manufacture February 1908.
This either brings the date for first use of Semi China forward a few years or the dish was made in the white in 1908, but not decorated and sold until about 1912.
Regards
Andrew
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