1. Condition: The condition of the bill is one of the most important factors in determining its value. A bill in uncirculated condition, meaning it has never been used or has been preserved very well, can be worth significantly more than a circulated bill that shows signs of wear and tear.
2. Grade: Numismatic grading services, such as the Professional Coin Grading Service (PCGS) and the Numismatic Guaranty Corporation (NGC), assign grade ratings to coins and bills based on their condition. A higher grade indicates that the bill is in better condition, and it can command a higher price.
3. Series and Design: The 1929 US $10 bill belongs to the "Series of 1928" and features a portrait of Alexander Hamilton on the front. The reverse of the bill depicts an image of the United States Treasury Building. The specific series and design of a bill can affect its value, especially if it is rare or sought-after by collectors.
4. Rarity: The 1929 US $10 bill is relatively common, but certain variations or errors in printing can make some notes more valuable.
5. Collectible Value: The value of a 1929 US $10 bill can also be influenced by its collectible value among numismatists and paper money enthusiasts. If the bill possesses unique characteristics or is part of a coveted series, it may attract higher bids from collectors.
Given all these factors, the value of a 1929 US $10 bill can range from a few dollars for a well-circulated bill to several thousand dollars for a bill in uncirculated condition, with a desirable series or grade, or one that has exceptional rarity. To determine the exact value of your bill, it is advisable to consult with a professional numismatist or reference reputable coin and currency price guides.