The Set VI stamps, perforated 10 on single-line
USPS paper stock, proved to be just a little too difficult to
separate, often resulting
in a tear in the stamp itself when the perforations were separated.
In 1916, the year
the U.S. became involved in
World War
I, every effort was
made to economize in order to put all of our resources into the war. Unwatermarked
paper was cheaper to produce than watermarked paper and as the single-line
watermarks were difficult to detect anyway and not that effective a
security measure, in late
1916 the Post Office Department
agreed to print the stamps on unwatermarked
paper stock, using the 10 gauge perforation of the previous two
years. The perforated 10 stamps, printed on unwatermarked paper
stock are listed in Scott as numbers 462
through 478.
In 1917, the
supply of $2 and $5 stamps from the 1902 issue was finally drying
up, coupled with a sudden surge in demand for high value
denominations associated with the transfer of bonds at the start of
the first World War and a lack of time to make new designs, it was
decided to simply use the existing designs of the 1902 Series to create new plates and
print the $2 and $5 stamps on the unwatermarked paper stock and
perforate the stamps 10 gauge. Although the design is not Washington
or Franklin, these stamps are considered by most to complete
this Set, and are most commonly listed as Scott numbers 479
and 480.
Set VIII Imperforate: The one through five cent
stamps were issued imperforate using the unwatermarked paper
stock and the flat plate printing method, and are listed as Scott numbers 481 through 485.
Many of these were privately perforated.