THE ASSOCIATION,QUICKSILVER MESSENGER SERVICE,GRASS ROOTS AND SOPWITH CAMEL AT THE FILLMORE AUDITORIUM ON JULY 22-23/1966.ARTIST WAS WES WILSON.SIZE IS JUST OVER 13-7/8"X19-7/8". HANDSIGNED BY WES AT HIS FARM IN MISSOURI ON 3/22/2004. I WAS LUCKY ENOUGH TO GET INVITED THERE SEVERL TIMES.PAPER THICKNESS IS .007.REVERSE IS WHITE,WES'S NAME AND THE TICKET OUTSTRIP IS DONE IN DARK RED/BROWN COLOR.I USED ERIC KINGS'S POSTER GUIDE BOOK AND HE REFERS TO THIS PRINT AS OP-1A.IT IS BG18 IN THE ORIGINAL BILL GRAHAM SERIES.THIS POSTER IS GETTING REALLY HARD TO FIND IN ANY CONDITION.WILL BE SHIPPED WITH INSURANCE.