The term is attributed to Robson Lowe, a professional philatelist, stamp dealer and stamp auctioneer, who made the first organised study of the subject in the 1930s and described philatelists as "students of science", but postal historians as "students of humanity".
[1] More precisely, philatelists describe postal history as the study of rates, routes, markings, and means (of transport).
Much information is still not known about the workings of postal systems, and millions of old covers have survived, constituting a rich field of "artifacts" for analysis.
In studying or collecting any postal history subject some overlap is inevitable because it is impossible to separate the different areas that affect the mail from one another; transportation, rates, geography and subject are all intertwined, but the emphasis remains different depending on the chosen topic.
The era for a geographical based study can add dimension depending on the services available or the changes that took place.