I have 2 blue and white earthenware plates with the Eternal Light Peace Memorial Gettysburg on the front and the gettysburg address on the back. It is marked Old English Staffordshire Ware with Jonroth mark and Adams mark on the back. It also says "imported exclusively for N.A. Meligakes Gettysburg P.A." Can anyone pass on any info about it, eg year of make, value etc. Thanks