All Plate Blocks of 4 are in individual glassines with Scott Catalog #'s on Each. All backs are clean. Make multiple purchases on the SAME PAYMENT DATE AND SHIPPING DATE. Customer will receive 1/2 price on P&H for any additional lower priced items. For example: a P&H rate of $2.50 and $1.00 will cost a total of $3.00.All postage used on the cover to your purchase are COLLECTABLE stamps and we take steps to get a GREAT postage cancel. Some of our customers LOVE these covers and we hope you will also.