A three-party collaboration between PlayStation, God of War, and the China Post is currently going on in China - the three parties are releasing a limited set of commemorative stamps featuring Kratos and his son, Atreus.
The China Post and PlayStation have previously set up a "Father & Son" themed stage station on Si'Nan Road, Shanghai.
God of War Themed Post Box
In order to get the God of War commemorative stamps, you will need to go to the stage station between November 1 and November 30 and hand-write and send out a family greeting card. The first 60 participants each day will be given a set of the God of War stamps.
God of War Themed Stamps
Source: Weibo