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Railway Post Office: (R.P.O) Portable mail-handling equipment for sorting mail in transit on trains.
Receiving mark: A postmark or other postal marking applied by the receiving, rather than the originating, post office.

Redrawn: A stamp design that has been slightly altered yet maintains the basic design as originally issued.

Re-engraved: A stamp with an altered design as the result of a change made to a transfer roll or printing plate prior to a later printing, thereby distinguishing it from the original die.

Regional: Stamp sold or valid in a specific area of a stamp-issuing entity. Great Britain has issued stamps for the regions of Guernsey, Jersey, Isle of Man, Northern Ireland, Scotland and Wales. Regionals are usually sold only in a given region but are often valid for postage throughout a country.

Registered mail: First-class mail with a numbered receipt, including a valuation of the registered item, for full or limited compensation if the mail is lost. Some countries have issued registered mail stamps. Registered mail is signed for by each postal employee who handles it.

Registration labels: Adhesive labels indicating the registry number and, often, the city of origin for registered articles sent through the mail.

Regummed: A stamp bearing adhesive from an unauthorized source.

Reissue: An official reprinting of a stamp from an obsolete or discontinued issue. Reissues are valid for postage. Reprint.

Remainders: Stocks of stamps remaining unsold at the time that an issue is declared obsolete by a post office. Some countries have sold remainders to the stamp trade at substantial discounts from face value. The countries normally mark the stamps with a distinctive cancel. Uncanceled remainders usually cannot be distinguished from stamps sold over the counter before the issue was invalidated.

Repaired stamp: A damaged stamp that has been repaired in some way to reinforce it or to make it resemble an undamaged stamp.

Replica: A reproduction of a stamp or cover. In the 19th century, replica stamps were sold as stamp album space fillers. Replica stamps are often printed in one color in a sheet containing a number of different designs. Replicas can sometimes deceive either a postal clerk or collectors.

Reprint: A stamp printed from the original plate, after the issue has ceased to be postally valid. Official reprints are sometimes made for presentation purposes or official collections. They are often distinguishable in some way from the originals: different colors, perforations, paper or gum. Private reprints, on the other hand, are usually produced strictly for sale to collectors and often closely resemble the original stamps. Private reprints normally sell for less than original copies. Reprints are not valid for postage..

Retouch: The repairing of a damaged plate or die, often producing a minor, but detectable, difference in the design of the printed stamps.

Revenues: Stamps representing the prepayment or payment of various taxes. Revenues are affixed to official documents and to merchandise. Some stamps, including many issues of the British Commonwealth, are inscribed “Postage and Revenue” and were available for either use. Such issues are usually worth less fiscally canceled than postally used. In some cases, revenues have been used provisionally as postage stamps.

Rocket mail: Mail flown in a rocket, even if only a short distance. Many rocket mail experiments have been conducted since 1931. Special labels, cachets or cancels usually note that mail was carried on a rocket.

Rotary plate: A curved or cylindrical printing plate used on a press that rotates the plate to make continuous impressions. Flat plates make single impressions.

Roulettes: The common way of separating stamps is by perforating, But another method used was by ROULETE. With this system the machine does not punch holes but cuts little slits. Various types were used in rouletting.

Rouletting: The piercing of the paper between stamps to make their separation more convenient. No paper is actually removed from the sheet, as it is in perforating. Rouletting has been made by dash, saw tooth or wavy line.

Rust: A brown mold resembling the rust in iron. Rust affects stamp paper and gum.