Illegal stamp of São Tomé and Príncipe | Sao Tome and Principe postage stamps
Sahara OCC R.a. S. D, 40 (1997) - Western Sahara - Illegal Stamps - LastDodo | Stamp, Sahara, Postage stamps
Cinderella stamp in the Haiti series issued in 1975. Illegal issue produced without the permission of the Haitian post office, the label had no legal postal value Stock Photo - Alamy
Illegal Stamp Country List
This is why putting a stamp upside down on a letter could get you into serious trouble | The Sun
WADP, WNS and the Illegal Postal Stamps - Balance Sheet 10 years later
Illegal Usages of U.S. Revenue Stamps Used as Postage Stamps on Covers - Revenue-Collector.Com