NC1-8 have postmark cancellations on reverse as a guarantee. NC9-10 do not have postmark cancellations. There are also expertizing marks in pencil on reverse for NC1-3 and NC5-10.
All sound stamps and contained in Shogard mounts. Scans at 10X show the entire lot. Member of American Philatelic Society.Take a look at the other collectibles I have for sale. This item is in the category "Stamps\Europe\Yugoslavia". The seller is "skips-closet" and is located in this country: US. This item can be shipped worldwide.