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Stamp Market Tips: Nicaragua local post stamps Nicaraguan local post stamps
Nicaragua-Cabo Gracias a Dios — In the early part of the 20th century, local post stamps were issued for two Nicaraguan regions, the province of Zelaya (also known as Bluefields) and Cabo Gracias a Dios. (Read more...)

Spink offering mint Jenny Invert Spink offering mint Jenny Invert
A top-quality example of the United States 1918 24¢ Jenny Invert airmail error (Scott C3a) will be offered at auction May 21. T (Read more...)

American Topical Association launches stamp checklist database
The American Topical Association has launched a new database for its popular topical checklists. (Read more...)

Stamps of Latin America: Costa Rica’s first airmail stamp Costa Rica’s first airmail stamp arrived before regular airmail service
Costa Rica’s first airmail stamp was issued in happy anticipation of a service that did not come to pass — at least not right away. (Read more...)

Film in Canada honored with five stamps issued May 2 Film in Canada honored with five stamps issued May 2
On May 2, Canada Post issued nondenominated (85¢) National Film Board of Canada permanent stamps with five different designs. T (Read more...)

Jersey Poppy stamps can be planted Jersey Poppy stamps can be planted
On May 6, Jersey issued six stamps and a souvenir sheet featuring poppies and commemorating the 100th anniversary of World War I. One of the stamps is shown nearby. (Read more...)

Second plate number on 34¢ Hummingbird coil Second plate number assigned to new 34¢ Hummingbird coil
Just months after its Feb. 7 issue date, the United States 34¢ Hummingbird coil stamp (Scott 4858) has been found with a new plate number of P22222. (Read more...)

U.S. Stamp Notes: Expertizing tools Tools can help you determine if your stamp is worth expertizing
I promised in the last expertizing column (Linn’s, April 28, page 6) that this installment would focus on the tools that expertizers use. (Read more...)

Essays and Proofs: Producing plate proofs United States plate proofs printed on India paper and cardboard
Plate proofs are the result of “proving” the finished plate. Just as die proofs were used to check the accuracy of a finished die, plate proofs were used to check the accuracy of the finished plate before it went into production. (Read more...)

National Postal Museum Treasures: Letters from Liberia Finding guide helps researchers track down Liberia material
The Smithsonian’s National Postal Museum recently published an online finding guide to its extensive collections of Liberian philately. (Read more...)

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