Pewter Charger Plates 12 Inches Greek Key Design

I believe these are pewter charger plates that are 12 inches in diameter and have a greek key design.  It is shiny/glossy on front and around the rim on the back.  On the back there are dings and other marks which also make me think these are pewter.  This came from an unclaimed storage facility and there were a total of 10 charger plates.  There is a price tag on the back of each plate for $227with the number 3110942.  There were many high end antiques and other items including sterling in the facility.  I would like confirmation that these are pewter and what the value would be per plate.  I wasn't sure if the $227 price tag was really per plate or maybe for the set of 10 or not reliable at all.  I appreciate any help.  Thanks!