These are obsolete United States paper money, specifically a series of Silver Certificates issued in 1899 featuring an allegorical vignette of an eagle. These notes were redeemable for one silver dollar and were part of a larger series of certificates backed by silver held by the U.S. Treasury. Their distinctive design, featuring a prominent black eagle, distinguishes them from other currency of the era.
They represent a tangible piece of American financial history. Their value to collectors is primarily driven by condition, rarity (determined by the specific signature combinations), and historical significance. They offer insights into the silver standard monetary system of the late 19th century and the intricate engraving processes used to produce currency at the time. Their existence reflects a period when paper money represented specific stores of precious metal.