Correios de Portugal (CTT, the Portuguese Postal Service) and the Portuguese Assembly of the Republic recently issued the world's first stamp made of cork.
It is made entirely of self-adhesive cork paper, and has a face value of 1 euro. It was designed by artist João Machado, in homage to the Portuguese cork sector, which put Portugal at the forefront of world cork production and exports.
In addition to the 230,000 stamps included in the philatelic plan, an extra 10,000 stamps were produced bearing an Amorim Group promotional logo.