I, AM A BUSINESS OWNER WHO PURCHASED AN ESTATE AND ONE OF THE ITEMS WAS A SIGNED DEAN MEEKER SERIGRAPH . ON THE BOTTOM LEFT HAND SIDE IS THE NAME HORSEMAN IN THE MIDDLE IT SAYS PROOL , AND THE RIGHT IS HIS SIGNATURE. IT IS 5 HORSEMAN GREEN, BLACK, AND RED. CAN ANYBODY TELL ME WHAT PROOL MEANS AND POSSIBLE APPROXIMATE VALUE?