Because First-Class postage was only two cents per ounce and only four pounds could be mailed..... even with the addition of the eight-cent stamp for registration fees, the most that could be spent on anything mailed First-Class was $1.36. This made the two-, three-, four-, and five-dollar Columbian stamps useless for mailing. Further, the only way to get the full value for five five-dollar Columbian would be to mail a 62-pound, eight-ounce package of books at the book-rate class of postage.
History of the Post Office:
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