This is a stamped stamp sheet purchased at the post office to commemorate November 11, 1999 (Heisei 11). The stamps have already been stamped, so they cannot be used as postage, but would this be of interest to someone who collects them as a keepsake? It has been stored in a storage case at home, in a dark place. There were no noticeable stains or marks. It will be shipped via Yu-Packet Post Mini with waterproof packaging. Immediate purchase is welcome. ^ ^ Please note that I will not respond to price reduction comments. m(_ _)m