History isn't written by historians; they merely try to make sense of it. History is written by people, famous and not so famous.
I collect a subspecialty of postal history—the messages written by everyday people on the backs of postal cards, which are government-issued cards with a preprinted stamp on the card. (Because Canadians have slightly different terminology; they call them 'postal stationery cards' to differentiate them from picture post cards.)
I focus on Alaskan postal history and the history of a turn-of-the-20th century postal card that featured a portrait of John Adams.
North American stamp collectors classify postal cards using the "UX" prefix found in the dominant American (Scott's) and Canadian (Unitrade) catalogs.
19th-century postal cards
mailed from Alaska
(links to Internet Archive)
John Adams postal card (UX15) mailed abroad (to come)