1. Condition: The overall condition of the dictionary, including the binding, pages, and any additional features like maps or illustrations, will significantly impact its value. A dictionary in excellent condition with minimal damage or wear will generally be more valuable than one that is heavily worn or damaged.
2. Rarity: The scarcity of a particular edition can also affect its value. If the 1859 Webster's dictionary is a rare edition or has unique features, it may be more valuable to collectors.
3. Binding: The type of binding can also influence the value. Leather-bound dictionaries are often considered more valuable than those with cloth or paper bindings.
4. Provenance: If the dictionary has any notable history or provenance, such as being owned by a famous person or institution, it may add value to the item.
5. Illustrations: The presence of illustrations, maps, or other visual elements can also contribute to the value of the dictionary.
It's worth noting that the value of rare books and collectibles can fluctuate over time and can be influenced by market trends and buyer interest. To get a precise estimation of the value of your 1859 Webster's dictionary, it's recommended to consult with professional appraisers or experts in rare books and collectibles.