As of 2015, the best way to determine the value of a 1921 dollar coin is by consulting a coin appraiser. Coin appraisers can be found in most major cities and online.
The Professional Coin Grading Service, orPCGS, website can help users locate legitimate and certified coin dealers and appraisers. The PCGS has certified and graded more than 30 million coins. Price guides are also available.
The Coin Study site is another good resource for determining a coin's value. The extensive online catalog provides information on numerous coins.
The value of a coin is determined by its condition, rarity and the market demand. Professionals offer the most accurate appraisals.