The 1876 Centennial Share Certificate is generally accepted as the earliest "souvenir card" produced by the Bureau of Engraving & Printing. This massive, ornately engraved sheet was sold as a way to raise funds for the 1876 Centennial Exhibition, and was kept by many donors as a memento. It was reprinted by the BEP in 1988 as FB-1988B. Over the years, the Bureau was often called on to produce commemorative programs, invitations, World's Fair souvenirs and award diplomas, and memorial cards. Though significant print runs of some early cards are known, these numbers can be deceptive, as relatively few examples survived. Since these specialty BEP cards are still being produced, "FB" catalog numbers remain in use despite the fact that they are technically no longer "forerunners." Because unknown cards are regularly discovered, the SCCS adopted a year-based numbering system for all the forerunner categories.