The magnetic card telephone system of the GPT was installed in the Chinese autonomous region in April 1990, when it was still a Portuguese colony. For the occasion two sets of 7 cards each were issued: a series with tourist views, and a series that publicized the services of CTM, the local telephone company: a first issue of 14 cards! All the cards had the prefix code 1MAC + a letter on the back, and the face values expressed in MOC $ (Macau Pataca, the local currency).
