Covering 120 years of history, the subjects include anything from the doomed RMS Titanic (pictured above) to the comic and risqué illustrations of Donald McGill.
Plain postcards were introduced in 1870 but it was not until the early 20th century that subject cards rose in popularity.
In their heyday, a specialist magazine was published from 1900-07 and cards on a huge variety of themes were sent, many of which were stored in albums.
Since the 1950s, vintage editions have become a lively collecting field.
The Postcard Traders Association represents UK and international dealers in the field along with auctioneers, fair organisers, publishers and accessory distributors.