Here are some factors that can affect the value of a 1929-W US dime:
* Condition: The condition of a coin is one of the most important factors in determining its value. A coin that is in mint condition will be worth more than a coin that is worn or damaged.
* Rarity: The rarity of a coin can also affect its value. Some coins are more rare than others, and therefore more valuable. For example, the 1929-W dime is a relatively rare coin, with only about 1.2 million minted.
* Variety: There are many different varieties of 1929-W dimes, each with its own unique characteristics. Some varieties are more rare than others, and therefore more valuable. For example, the 1929-W dime with a doubled die error is a very rare variety, and can be worth up to $500.
If you have a 1929-W US dime, it is important to have it appraised by a professional coin dealer to determine its exact value.