19-045, 2019, Lowell National Historical Park , Pictorial Postmark, Event Cover,
What is an Event Cover:
In philately, a
cachet
is a printed or stamped design or inscription, other than a cancellation or
pre-printed postage, on an envelope (my items are printed on a #6 envelope 6.5″x3.75″) to commemorate a postal or philatelic
event. There are official and private (independent of postal authorities)
cachets. They commemorate everything from the first flight on a particular
route, to the Sports Events. Cachets are also frequently made, either by
individuals or a government, for first Day of Issue, first day stamp events or
“second-day” stamp events. They are often present these event covers.