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
CTT Philately
