1. Edition: The first edition of Encyclopedia Americana was published in 1829, and there were several editions published in subsequent years. The 1856 edition may refer to the "13th edition" or "14th edition" of the encyclopedia. The earlier editions tend to be more valuable, as they are considered more rare and historically significant.
2. Completeness: A complete set of Encyclopedia Americana from 1856 should consist of 14 volumes, each covering different subjects or letters of the alphabet. The presence of all 14 volumes can significantly increase the value of the set.
3. Binding: The type of binding can also affect the value. Sets that are bound in leather or hardcover are generally more valuable than those bound in cloth or paperback.
4. Condition: The overall condition of the set plays a crucial role in determining its worth. Sets that are in good condition, with minimal damage to the bindings, pages, or covers, are more valuable than those that are heavily worn or damaged.
5. Provenance: If the set has a notable history or provenance, such as being owned by a famous person or institution, it can add to its value.
6. Market Demand: The demand for antique encyclopedias can fluctuate over time, so the current market conditions can influence the value of the set.
Based on these factors, the value of a set of Encyclopedia Americana from 1856 can range from a few hundred dollars to several thousand dollars. It is recommended to consult with reputable antique book dealers or auction houses to get a more accurate assessment of its value.