Here are some of the factors that can affect the value of an 1809 US half cent:
* Condition: The condition of a coin is one of the most important factors in determining its value. Coins that are well-preserved and have no major defects will typically be worth more than coins that are damaged or worn.
* Rarity: The rarity of a coin can also have a significant impact on its value. The 1809 US half cent is a relatively rare coin, with only a few thousand examples known to exist. This rarity makes it a highly sought-after coin among collectors, which can drive up its value.
* History and provenance: The history and provenance of a coin can also add to its value. If a coin has a well-documented history and can be traced back to a famous owner or collection, it may be worth more than a coin that does not have such a history.
If you have an 1809 US half cent, it is important to have it appraised by a professional coin dealer or numismatist to determine its exact value.