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. Rarity: The rarity of the specific series and type of the $10 bill also affects its value. Some series and types are rarer than others, and those that are considered rare can command higher prices.
3. Demand: The demand for 1925 $10 bills among collectors plays a role in determining their value. If there is a high demand for these bills, their value may increase.
Based on these factors, the value of a 1925 US $10 bill can range from a few hundred dollars to several thousand dollars. It's important to consult with reputable coin and currency dealers or experts to obtain a more accurate valuation based on the specific characteristics and condition of the bill.