Here are some factors that can affect the value of a 1926 US $10 Federal Reserve Note with a red seal:
* Condition: The condition of the note is one of the most important factors in determining its value. A note that is in uncirculated condition, meaning it has never been folded or circulated, is worth more than a note that has been circulated and shows signs of wear.
* Serial number: The serial number of the note can also affect its value. Notes with low serial numbers or consecutive numbers are more desirable to collectors and can command a higher price.
* Signature: The signatures of the Secretary of the Treasury and the Treasurer of the United States on the note can also affect its value. Notes with signatures that are clear and legible are more desirable than notes with signatures that are faded or smudged.
* Rarity: The rarity of the note can also affect its value. Some 1926 US $10 Federal Reserve Notes with red seals are more rare than others, and these notes can command a higher price.
If you have a 1926 US $10 Federal Reserve Note with a red seal, it is best to have it appraised by a professional numismatist to determine its exact value.