#579 Used Block of 4 w/ CLEAN 1999 PF Cert. Completely fault-free block, very choice fresh & Scarce used block with a neat target cancel at center. We strive to describe the items as accurate as we can. Check out our other auctions! We strive to display the highest quality images. What you see is what you get. We are committed to your 100% satisfaction. Wait for our response before you return the item. Return time will be extended to 90 days from the date of the sale. The free listing tool. The item “Momen US Stamps #579 Used Block of 4 SCARCE XF PF Cert” is in sale since Thursday, March 07, 2013. This item is in the category “Stamps\United States\Plate Blocks/Multiples”. The seller is “momenstamps” and is located in Cary, North Carolina. This item can be shipped worldwide.