1) Edition and condition: The exact edition and condition of the dictionary will significantly affect its value. First editions in good condition will command higher prices.
2) Binding and cover material: The type of binding and cover material can also affect the value. For example, a leather-bound dictionary will generally be worth more than a cloth-bound one.
3) Desirable features: Certain features can make a dictionary more valuable to collectors, such as special illustrations or maps, a presentation inscription, or a famous previous owner.
4) Market demand and supply: The overall market demand and supply for antique dictionaries will also influence the price. Scarcer editions or those in high demand may fetch higher prices.
Given these factors, it's best to consult with reputable booksellers or appraisers specializing in antique books to get a more accurate estimate of the worth of a specific 1923 Websters dictionary.