While visiting the Phuket Philatelic Museum last week, I bought several packages of postcards issued by Thailand Post, including a set of seven picturing the evolution of the post box in Thailand. The first, shown below, illustrates the first design which was first put into use in 1883 – the same year that the nation released its first postage stamps. The first general post office in Bangkok is in the background.
Design 2 (above) was put into service in 1911.
This third pillar box design was initiated in 1926.
Design 4 first saw service in 1953.
These final two designs were both put into use in 1973. There are many of Design 6 all around Phuket, plus one or two additional designs.