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Buy collectible sheets of US stamps, often sent to the United States Post Office before they cut them up for retail. US sheets of stamps for sale.
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Almost all stamps issued today in the United States and elsewhere, are printed as sheets of stamps. These are then sent to the post office, which then cuts them up and sells them individually or in smaller groups. For the stamp collector, sheets tend to be much more valuable than the individual stamps since they are typically unused and unbroken.
Depending on how rare the stamps are, the sheets can be valuable. Most modern sheets of the most common stamps are not worth much, other than the face value of unused stamps. Although if you have a sheet of rare stamps, these can oftentimes be extremely valuable since you have multiple rare stamps all on a single sheet.