Because of the physical and mental demands placed on RPO clerks, the Railway Mail Service pushed the adoption of standardized floor plans and fixtures for all RPO cars, with the first plans published in 1885.
Ultimately the problem of stamp cancellation was solved by the adoption of killer cancels.
Killers are inked devices that cancel a stamp heavily enough that there is no possibility of the ink being washed out and the stamp being re-used.
New South Wales had predicted Britain's adoption of prepaid postage by producing embossed letters as early as 1838. But adhesive stamps were lagged behind by 12 years.
Other first foreign stamps ...
With the adoption, on 6 May 1840, of Sir Rowland Hill's plan the world's first postage stamp was born.
ZIP+4 - the last four digits in ZIP+4. The addition four digits more precisely pinpoint the final destination. Larger mail volumes, increasing numbers of delivery addresses, and the adoption of automated machinery made ZIP+4 a necessity in 1983.
 See also: Used, Trans, Stamp, Condition, Red
  
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