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  2. Transportation coils - Wikipedia

    en.wikipedia.org/wiki/Transportation_coils

    Canoe, 5 cents, plate number S11. The Transportation coils series is a set of definitive stamps issued by the United States Postal Service between 1981 and 1995. Officially dubbed the "Transportation Issue" or "Transportation Series", they have come to be called the "transportation coils" because all of the denominations were issued in coil stamp format. [1]

  3. Progressive stamping - Wikipedia

    en.wikipedia.org/wiki/Progressive_stamping

    Progressive Die is a metalworking method that can encompass punching, coining, bending and several other ways of modifying metal raw material, combined with an automatic feeding system. The feeding system pushes a strip of metal (as it unrolls from a coil) through all of the stations of a progressive stamping die. [ 1 ]

  4. Gutter (philately) - Wikipedia

    en.wikipedia.org/wiki/Gutter_(philately)

    1953 DDR stamp sheet with St. Andrew's crosses printed in the gutters Top 30 stamps of an 1898 Cuban sheet showing a typical vertical gutter margin that divided the sheet into two panes of 50 stamps each. In philately, a gutter is the space left between postage stamps which allows them to be separated or perforated. [1]

  5. Die proof (philately) - Wikipedia

    en.wikipedia.org/wiki/Die_proof_(philately)

    Die proof for the United States Jefferson issue of 1861 Approved proofs from Waterlow and Sons printers for a Bolivian stamp issue of 1943. (Subsequently punched for security purposes.) In philately a Die Proof is a printed image pulled directly from the master die for an engraved stamp.

  6. Americana series - Wikipedia

    en.wikipedia.org/wiki/Americana_series

    The Americana series was the first definitive issue since that of 1922-31 not to include any fractional-cent values; instead, it presented the first decimal values assigned to U. S. Postage stamps, which appeared on coil stamps denominated between 3.1 cents and 8.4 cents, produced for the use of bulk mailers and other businesses.

  7. U.S. Parcel Post stamps of 1912–13 - Wikipedia

    en.wikipedia.org/wiki/U.S._Parcel_Post_stamps_of...

    A special printing of the 1912–13 Parcel Post stamps was made for the Panama–Pacific Exposition held in San Francisco in 1915 from the dies that made the printing plates for this series of stamps. They are referred to as Die Proofs and are printed directly from the die on soft yellowish wove paper one at a time. Subsequently, die proofs ...