1. Condition: The condition of the coin plays a significant role in determining its value. Coins that are well-preserved, have no significant wear or damage, and retain their original luster and details are generally more valuable. Various coin grading services, such as the Professional Coin Grading Service (PCGS) and Numismatic Guaranty Corporation (NGC), assign condition grades to coins, ranging from "Poor" to "Mint State."
2. Rarity: The rarity of the coin also influences its value. The 1927 liberty silver dollar, also known as the Peace dollar, is not considered a particularly rare coin, as there were over 86 million minted that year. However, specific variations or errors within the 1927 Peace dollar series may carry higher premiums due to their rarity.
3. Market Demand: The demand for 1927 Peace dollars in the numismatic market also affects their value. Silver bullion prices can influence the demand for such coins, as they contain silver content. Additionally, the general interest and enthusiasm among collectors for 1927 Peace dollars can drive their value up.
Considering these factors, the value of a 1927 liberty silver dollar with an eagle on the back and the words "E pluribus unum" can range from a few dollars for a common, well-worn coin to several hundred or even thousands of dollars for rare or exceptional specimens in mint condition. It's recommended to consult with reputable coin dealers or experts to obtain an accurate appraisal of your coin's value based on its specific characteristics and condition.