The exhibition space consists of two rooms:
 
The first is dedicated to the history of Greek post offices and their long course from 1828 until today. The first mailboxes from 1895, letter sealing machines, letter and small scale scales, trumpets, bags and uniforms of distributors, telephone devices, etc. are on display.
 
In the second room the visitor, among other things, can see the first Greek stamps with the Great Heads of Hermes (1861) whose aesthetic, artistic and historical value is unique. Also the copperplate plates used for their printing, models, sheets and essays, color scales, first day envelopes, etc., from a series of stamps designed by artists, such as the painter D. Biskinis and the engravers A. Tassos, I. Kefallinos, etc.
 
A large part of the exhibits is dedicated to the Olympic stamps, since Greece is the first country internationally to issue stamps dedicated to the 1896 Olympic Games, which took place at the Kallimarmaro Stadium.
 
On the first floor of the building there is a meeting room, screenings and other related events. In the same area is also the library with a significant number of books and archives on postal and philatelic issues. Includes books, magazines, exhibition catalogs, auction catalogs, manuscripts, museum guides, albums and archival material.
 
Among other things, the first philatelic magazines of the 19th century, philatelic albums, legislation concerning the history of the Greek Post Office and stamps from the second half of the 19th century to the modern era. In addition to the stamps themselves as a final product of the artistic work, the original drawings, often watercolors, engravings, drawings, etc. of the artists, on which the final illustration of the stamp as well as postal items such as stamps, mailboxes were based etc.