* Condition: The condition of the book is paramount. A pristine, first edition in excellent condition would be significantly more valuable than a worn and damaged copy.
* Binding: The type of binding (e.g., full leather, half leather, boards) affects the value.
* Edition: There might be different editions published in 1820, each with varying rarity and value.
* Market Demand: The price of rare books fluctuates depending on market demand. A book that was worth a certain amount a few years ago may be worth more or less now.
How to find out the value:
1. Professional Appraisal: The best way to get an accurate estimate is to consult a professional rare book appraiser. They can examine the book and provide an informed opinion.
2. Online Booksellers: Look up similar editions on online platforms like Abebooks, Rare Book Hub, or LibraryThing. Compare prices to get a sense of the market value.
3. Auction Records: Search for auction records of similar editions. Auction databases like Heritage Auctions or Sotheby's might provide insights into previous selling prices.
Remember, be cautious about online valuations without proper expertise. A book that appears valuable online might not be authentic or in good condition.