Portugal 2019 Issue - Nativity scene

Christmas Souvenir Sheet - Nativity Scene

A special souvenir sheet stamp issued by CTT Portugal. This stamp sheet has a special cross perforation but the most feature appeal of this stamp is it's built-in LED that get’s activated when you place it on top of an NFC capable phone.

Cross perforation stamp sheet.

    

I'm using an iPhone 7 which is an NFC capable phone. The LED light blinks continuously representing a twinkling star.

Blinking lights when subjected near NFC