SET III - Single-line Watermark - Perf 12 of 1910  In 1910, a year after the "failure" of the blue paper experiment, a further attempt was made to reduce paper shrinkage and the subsequent waste by reducing the watermark from a double-line mark to a single-line mark. It was thought that this might strengthen the paper stock by removing less paper in the watermarking process. The stamps in Set III are listed as Scott numbers 374 to 382. Note that nearly all of the denominations with the double-line USPS watermark were re-printed in the 1910 single-line watermark experiment, with the exception of the 13c, 50c and $1 stamps. Set III Coils and Imperforates: The one, two, and three cent perforated 12 coils and the imperforate stamps of this period were printed on the same single-line USPS watermarked paper stock as the Set III stamps. As with the Set I stamps, these stamps were produced to be distributed in vending machines, with the imperforate issues primarily produced for private vendors, such as Schermack, Brinkerhoff, and U.S. Automatic. These stamps are listed as Scott numbers 383 through 389.   Next: Set IV The Perf 8.5 Coils of 1910    A Guide to the Washington Franklins 1908 · 1909 · 1910 · 1910 Perf 8.5 · 1912 · 1914 · 1915 · 1916 · 1916 Coils · 1917 · 1918 · 1919 · 1919 Shanghai

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