Finished proofs are made for record and historic preservation purposes. These proofs are made showing the final production process. Typically, sets were gathered of each printing of each denomination. If the face of a certificate had four ink colors, four separate pieces were gathered. These sets could be used in future printings to exactly match ink color, density, and other properties. These sets generally included composite printings showing two or more of the inks and were topped off with a finished specimen.

  Sets of proofs similar to those described above are in the Finance Corps Museum. They are bound together in booklets. The booklet covers use the terminology "Composite Impression" and "Progressive Impression" more or less interchangeably. Collectors generally call proofs of this type progressive proofs.

  A few examples are shown below.