1. Condition: The condition of the coin is a crucial factor in determining its value. Coins in excellent condition, with minimal wear and tear, are more valuable than those that are heavily circulated or damaged.
2. Rarity: The 1790 Penny John Wilkinson Iron master is a relatively rare coin, with only a limited number known to exist. The rarity of a coin can significantly increase its value, especially among collectors who seek rare and unique items.
3. Historical Significance: This type of coin holds significant historical value as an early American coin, representing the early days of the United States Mint and the development of coinage in the country. Coins with historical significance are often sought after by collectors and can command higher prices.
4. Certification: Having the coin certified by a reputable numismatic organization, such as the Numismatic Guaranty Corporation (NGC) or the Professional Coin Grading Service (PCGS), can add value to the coin by providing assurance of its authenticity and condition.
5. Market Demand: The value of the coin is also influenced by market demand and the willingness of collectors to pay a certain price for it. If there is a high demand for this specific type of coin, it can drive up its value.
It's important to note that the values of coins can fluctuate over time based on market conditions and changing trends in collecting. To obtain an accurate appraisal of the value of a specific 1790 Penny John Wilkinson Iron master, it's recommended to consult a professional numismatist or coin expert who can assess the coin's condition, rarity, and historical significance.