This item is a collectible porcelain piece produced by Three Crown China. 

• The mark "Three Crown China" was introduced by the German manufacturer Unger & Schilde. 

• Similar vintage plates from this manufacturer often feature hand-painted floral or intricate decorative patterns. 

• Items marked with this stamp were imported and distributed in the United States by John H. Roth & Co. between roughly 1909 and 1916