This lovely polychrome pattern was printed in black with the colors applied by hand at the Enoch Wood & Sons pottery in Burslem, Staffordshire. They were in business from 1818 to 1846. The TCC Daatabase has a plate in the same pattern with a “Copeland, Late Spode” printed mark and an impressed mark that dates to 1890 or later (pattern 2733). This suggests the pattern remained popular for many decades. It is, of course, possible other potteries made it as well. The Database has nine other patterns with the name “Siam” in a range of designs but no others matching this one. Siam was the colonial era name for Thailand. Photo courtesy of ebay seller: Cobblestone Glass and Porcelain.