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For the first time in the world a stamp with a printed circuit in graphene that contains a coded message.
To enjoy this innovative experience that your stamp has to offer, use your mobile device and proceed with the following steps:
1) Install the CTT Filatelia APP;
2) Then and after successfully completing the installation of the application, run it on your SmartPhone or Tablet;
3) Follow the chat and touch the stamp on the right-hand side of the souvenir sheet, with the device

Newest technological innovation - 500th anniversary postal service in Portugal.

CTT Philately

CTT Philately

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