This square plate was made by Sebring Pottery and used to promote support for the war by buying War Bonds and Stamps.  The pattern # is Chantilly IT-S284 with 22K Gold trim.   These were found in a deceased relatives dresser and were wrapped in newspaper.  They are in relatively good condition.  There is a little checking and some flaws but they are really extraordinary.  I did not know these were produced.  The marking on the back of the plate is "22 carat gold FOR VICTORY Buy war bonds and stamps. 6-34" square