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Packet letter: A letter carried by a ship operating on a regular schedule and carrying mail by contract with a government or a post office.

Packet: 1) A presorted selection of all-different stamps, a common and economical way to begin a general collection; 2) a ship operating on a regular schedule and contracted by a government or post office to carry mail.

Pair: Two unseparated stamps.

Pane: The unit into which a full press sheet is divided before sale at post offices. What a post office customer may refer to as a “sheet of stamps” is more properly called a pane.

Paquebot Mail: Cancellation indicating an item was mailed aboard a ship.

Par Avion: A French phrase meaning “By Air,” it appears on airmail etiquettes of most countries, along with a similar phrase in the predominant language of the country of origin.

Parcel post stamps: Special stamps created for payment of parcel post fees.

Part-perforate: A stamp with all perforations missing on one or more sides, but with at least one side perforated.

Paste-up: The ends of rolls of coiled stamps joined together with glue or tape.

Pelure paper: A strong, thin paper occasionally used in stamp printing. Pelure paper is translucent and resembles a slightly dark, thin onion-skin paper.

Pen cancellation: Stamps canceled with an ink pen or marker pen rather than a handstamp or machine cancel. Many early stamps were routinely canceled by pen. A pen cancel may also indicate that a stamp was used as a fiscal. Modern stamps may be pen canceled if a sorting clerk or delivery carrier notices a stamp has been missed by a canceling machine.

Penny Black: The black 1-penny British stamp issued May 6, 1840, bearing the portrait of Queen Victoria. It is the world’s first adhesive stamp issued for the prepayment of postage.

Perfins: Stamps perforated through the face with identifying initials, designs or holes in coded positions. Perfins are normally used by a business or government office to discourage pilferage or misuse of stamps by employees. Perfins may be either privately or officially produced.

Perforation gauge: A scale printed or designed on metal, transparent or opaque plastic, cardboard or other material to measure the number of perforation holes or teeth within the space of 2 centimeters.

Perforation: The punching out of holes between stamps to make separation easy. 1) Comb perforation-three sides of a stamp are perforated at once, with the process repeated in rows. 2) Harrow perforation-the entire sheet or unit of stamps is perforated in one operation. 3) Line perforation-holes are punched one row at a time. Line perforations are distinguished by the uneven crossing of perforation lines and irregular corners. Comb and harrow perforations usually show alignment of holes at the corners. Some forms of perforation may be difficult to distinguish.

Permit mail: A prepaid postages system of printing a mailer’s permit number on each piece of mail., eliminating the need of affix and cancel stamps on large mailings. Permits are available for all classes of mail and a variety exist.

Permit: Franking by the imprint of a number and additional information that identifies a mailer’s prepaid postage account, thereby eliminating the need to affix and cancel stamps on large mailings. The mailer must obtain a document (permit) that authorizes his use of this procedure.

Phantom philately: The collection of bogus stamps. The name is derived from Frederick Melville’s book Phantom Philately, one of the pioneer works on bogus issues.

Philatelic cover: An envelope, postal card or other item franked and mailed by a stamp collector to create a collectible object. It may or may not have carried a personal or business message. A nonphilatelic cover is usually one that has carried business or personal correspondence and has had its stamps applied by a noncollector. Some stamps are known only on collector-created covers. It is impossible to say whether some covers are philatelically inspired or not. See also Used and Postally used.

Philately: The collection and study of postage stamps, postal stationery and postal history.

Phosphor: A chemical substance used in the production of selected stamps to activate machines that automatically cancel mail. The machines react to the phosphor under ultraviolet light.

Photogravure: A modern stamp-printing process that is a form of intaglio printing. Plates are made photographically and chemically, rather than by hand engraving a die and transferring it to a plate. The ink in this process rests in the design depressions. The surface of the printing plate is wiped clean. The paper is forced into the depressions and picks up the ink, in a manner much like the line-engraved printing process.

Pictorial: Stamp bearing a picture of some sort, other than a portrait or coat of arms.

Pigeon gram: A flimsy message flown by pigeon post.

Plate block: A block of stamps from the corner or side of a pane including the selvage bearing the number(s) of the plate(s) used to print the sheet from which the pane was separated. Some stamp production methods, like booklet production, normally cut off plate numbers. In the United States, plate number blocks are collected normally as blocks of four to 20 stamps, depending on the press used to print the stamps. When each stamp in a pane is a different design, the entire pane is collected as the plate block.

Plate number block: A block of stamps from the corner or side of a pane including the selvage bearing the number(s) of the plate(s) used to print the sheet from which the pane was separated. Some stamp production methods, like booklet production, normally cut off plate numbers. In the United States, plate number blocks are collected normally as blocks of four to 20 stamps, depending on the press used to print the stamps. When each stamp in a pane is a different design, the entire pane is collected as the plate block.

Plate number: Numerals or an alphanumeric combination that identifies the printing plate used to print postage stamp images. In the United States, plate numbers on sheet stamps often appear in corner margin paper or side margin paper. Plate numbers on coil stamps were commonly trimmed off until about 1980; since then the number appears on stamps at specific intervals. Booklet plate numbers are often found on selvage attached to the pane.

Plate: The basic printing unit on a press used to produce stamps. Early stamps were printed from flat plates. Curved or cylindrical plates are used for most modern stamps.

Plating: The reconstruction of a stamp pane by collecting blocks and individual stamps representing various positions. This is possible for many older issues, but most modern issues are too uniform to make the identification of individual positions possible.

Plebiscite issue: A stamp issue promoting a popular vote. After World War I, a number of disputed areas were placed under temporary League of Nations administration, pending plebiscites to determine which nation the populace wished to join. Special issues note the upcoming vote in several of these areas; among them, Allenstein, Carinthia, Eastern Silesia, Marienwerder, Schleswig and Upper Silesia.

PNC: 1) A plate number coil stamp; that is, a stamp from a coil that is inscribed with a plate number. The abbreviations PNC3 and PNC5 identify strips of three or five coil stamps with the PNC located in the center position of the strip. 2) A philatelic-numismatic combination: a cover bearing a stamp and containing a coin, medal or token. The coin and stamp are usually related in such cases; often the cover is canceled on the first day of use of the coin.

Pneumatic post: Letter distribution through pressurized air tubes. Pneumatic posts existed in many large cities in Europe, and special stamps and stationery were often produced for the service.

Postage dues: Stamps or markings indicating that insufficient postage has been affixed to the mailing piece. Postage dues are usually affixed at the office of delivery. The additional postage is collected from the addressee.

Postal card: A government-produced postcard bearing a stamp imprint in the upper-right corner representing prepayment of postage.

Postal fiscal: Revenue or fiscal stamps used postally.

Postal history: The study of postal markings, rates and routes, or anything to do with the history of the posts.

Postal stationery: Stationery bearing imprinted stamps, as opposed to adhesive stamps. Postal stationery includes postal cards, lettercards, stamped envelopes, wrappers, aerograms, telegraph cards, postal savings forms and similar government-produced items. The cost to the mailer is often the price of postage plus an additional charge for the stationery item.

Postally used: A stamp or cover that has seen legitimate postal use, as opposed to one that has been canceled-to-order or favor-canceled. The term “postally used” suggests that an item exists because it was used to carry a personal or business communication, without the sender thinking of creating an item to be collected.

Postcard: A small card, usually with a picture on one side and a space for a written message on the other. Postcards have no imprinted stamp, so the mailer must also purchase postage to mail the postcard.

Postmark: Any official postal marking. The term is usually used specifically in reference to cancellations bearing the name of a post office of origin and a mailing date.

Precancel: Stamp with a special overprint cancellation allowing it to bypass normal canceling. In some cases the precancel also designates a specific mail-handling service, such as “Presorted First-Class.” Other precancels may include the city and state of the issuing post office. Precanceled stamps are used by volume mailers who hold a permit to use them.

Prephilatelic period: Period before adhesive stamps were introduced in any country.

Press sheet: A complete unit of stamps as printed. Stamps are usually printed in large sheets and are separated into two or more panes before shipment to post offices.

Prestamp covers: Folded letters or their outer enclosures used before the introduction of adhesive postage stamps or postal stationery.

Prestige booklet: A stamp booklet with oversized panes, descriptive information and stamp issues commemorating a special topic. Prestige booklets often include panes with no stamps that instead bear labels or additional information, along with panes bearing stamps.

Prexies: The nickname for the U.S. 1938-54 Presidential definitive series.

Printer’s waste: Misprinted, misperforated or misgummed stamps often created during the normal process of stamp production. Printer’s waste is supposed to be destroyed, but such material enters the philatelic market through carelessness and theft.

Printing: The process of imprinting designs on paper from an inked surface.

Pro Juventute: Latin, meaning for the benefit of youth.

Processing: Steps that finish a printed stamp sheet. Processing includes perforation, trimming, dividing the sheet into individual panes, and packaging for distribution.

Proofs: Trial impressions from a die or printing plate before actual stamp production. Proofs are made to examine a die or plate for defects or to compare the results of using different inks.

Provisional: A postage stamp issued for temporary use to meet postal demands until new or regular stocks of stamps can be obtained.