Different types of labels that not were used to pay postage.
There are a lot of labels are very similar to official stamps.
There are many reasons to print labels impersonating official stamps.
Revolutions, propaganda and greed are some of these reasons.
Here are some examples of triangular labels, some of them really beautiful.

Do you have triangle labels in your collection?
Please send them to me with a description and would love to display them on this page.