Are These legal postage? INTERNATIONAL PHILATELIC EXHIBITION
Can I use these as postage? I just bought a large collection of plate blocks, which I'm using as postage. Included were some of these. Some of these have hinge marks, some are damaged, some perfect, but still. Is this a souvenir or are they postage? Can I stick them on a postcard and mail it? (along with enough additional postage)
The hundreds of plate blocks are another issue as it's really difficult to slap enough 3 or 4c stamps on something to mail a letter!