A postmark is a postal marking made on an envelope, parcel, postcard or the like, indicating the place, date and time that the item was delivered into the care of a postal service, or sometimes indica
Postmark used on U.S. Navy ship
Austrian stamp and postmark
An early example of a Bishop mark.
One of several types of postmarks found on Pony Express mail
The London Penny Post was a premier postal system whose function was to deliver mail within London and its immediate suburbs for the modest sum of one penny. The Penny Post was established in 1680 by
Postmark
…to prevent the delay of the mail by carriers. In England during the latter part of the 17th century, several postmarks were devised for use with the London Penny Post, a postal system that delivered mailed items within the city of London. The postmarks bore the initial of the particular post office or handling house…
figure 1 Newspaper ad for Penny Post announcing service and postal rates and the advantages to trade and commerce which it offered.
Dockwra plaque in Lime Street, London
figure 2 Lime St. Postmark & heart-shaped Time-stamps
figure 3 Postmark used in 1681