"Chastened by their experience with the 1974 Christmas stamp, Postal Service officials resolved to overcome problems experienced with that original pressure-sensitive adhesive issue. When the 1989 stamps were announced, news releases and reports in the philatelic press stated that the adhesive on the 29-cent Eagle and Shield stamp would not migrate, would not stain, and would be soluble in water.
These claims were not precisely true, but as a practical matter they may meet the specifications that USPS officials established."
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