Passport stamp from Porto Airport, Portugal.
<ul><li><a href="//commons.wikimedia.org/wiki/File:Lisbon_Porto_Airports_passport_stamp.jpg" title="File:Lisbon Porto Airports passport stamp.jpg">Lisbon_Porto_Airports_passport_stamp.jpg</a>: Henrique Bente</li>
<li>derivative work: <a href="//commons.wikimedia.org/w/index.php?title=User:Perreyd&amp;action=edit&amp;redlink=1" class="new" title="User:Perreyd (page does not exist)">Perreyd</a></li></ul>
CC BY-SA 3.0
This file was derived from: <a href="//commons.wikimedia.org/wiki/File:Lisbon_Porto_Airports_passport_stamp.jpg" title="File:Lisbon Porto Airports passport stamp.jpg">Lisbon Porto Airports passport stamp.jpg</a>: <a href="//commons.wikimedia.org/wiki/File:Lisbon_Porto_Airports_passport_stamp.jpg" class="image"><img alt="Lisbon Porto Airports passport stamp.jpg" src="https://upload.wikimedia.org/wikipedia/commons/thumb/b/be/Lisbon_Porto_Airports_passport_stamp.jpg/50px-Lisbon_Porto_Airports_passport_stamp.jpg" decoding="async" width="50" height="56" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/b/be/Lisbon_Porto_Airports_passport_stamp.jpg/75px-Lisbon_Porto_Airports_passport_stamp.jpg 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/b/be/Lisbon_Porto_Airports_passport_stamp.jpg/100px-Lisbon_Porto_Airports_passport_stamp.jpg 2x" data-file-width="1822" data-file-height="2048"></a><br>