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Other stamps have been killed with the letters "N,""S," "E" or "W," indicating to the postal clerks in whichdirection the letter was to travel. All of these things contribute to the interest and valueof stamps and letters. Indeed, no stamp should ever beremoved from its original letter where anything in theway of a cancellation or postmark occurs either uponthe stamp or the envelope itself. Some stamps are morevaluable "on cover," that is, attached to the letters onwhich they were mailed. This is especially true of someof the higher denomination stamps of the nineteenthcentury. But the cover collector will demand that thestamp be "tied," that is, that the postmark or cancellationmust cover part of the envelope and part of the stamp,both under the same mark, thus "tieing" the stamp tothe cover. |
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