| The 1908 Series: Perf 12, Double-line Watermark, Original Designs, Flat Plate |
| The 1909 Experiment: The blue papers, an experiment to strengthen the paper,
using a higher rag content to reduce shrinkage and waste. |
| The 1910 Series: The double-line watermarked paper was changed to single-line watermarked paper
to strengthen the paper. Less paper removed in the watermarking process was hoped to strengthen the paper and reduce waste. |
| The 1910 Perf 8½ Coils: An attempt to lessen the separation of stamps in vending machines. The lesser number of holes
per inch, as opposed ot the perf 12 coils, was thought to help keep the stamps from separating too easily. |
| The 1912 Designs: The new designs were to comply with International Postal Union guidelines and to make it easier
for postl employees to distinguish varying denominations. |
| 1914: Perf 10 Stamps: The 8.5 gauge perforation experiment resulted in stamps that were too difficult to separate without tearing
the stamps themselves. The perforation spacing was narrowed slightly, from 8½ per 2cm to 10 per 2cm, in an attempt to make the stamps easrier to separate and
yet not come apart in vending machines. |
| 1915: Rotary Press with Watermark: A faster and more efficient printing method than the traditional flat plate printing method
was introduced to make coil stamps. The quality was nearly as good and it enabled the production of rolls of stamps, a must for coil production |
| 1916: Use of Non-watermarked Paper: The use of watermarked paper was an added expense, further, it was felt
that the watermarks were difficult to detect and therefore not an effective deterrent to counterfeiters |
| 1916 Rotary Coils on Unwatermarked Paper: |
| 1917 Perf 11 Stamps: The perf 10 stamps still sometimes tore when separating the
stamps. The perforation was narrowed even more, although not all the way to the original perf 12 gauge. |
| 1919: Offset Stamps This method was implemented in an effort to eliminate the abrasive effects
of the inferior inks available during World War I. By not using engraved plates wear was minimized and the plates lasted longer |
| 1919-1923: Coil and Sheet waste Stamps Several important Washington Franklin stamps were issued from coil waste, sheet waste and
as experimental rotary press printings. Many of these have compound perforations. |
| 1919: Offices in Shanghai The U.S. Post Office delivered postage stamps to Shanghai, China and the stamps were
subsequently overprinted "Shanghai China" and surcharged at double the original denomination on all values, 1¢ through $1,
creating a new set of denominations, 2¢ through $2. |