Plates are 7 1/2" in diameter. All 3 have some aging with one having a fairly large crack as shown. The other two do not have cracks vs some aging and small marks. Made of solid ceramic. Have the Coat of Arms/Seal of the William Penn Club of Philadelphia including the phrase dum clavum teneam. William Penn Esq. Proprietor 1703.
Unsure of the date but have had these in my possession since the 1980's and know they are much older than than.