Finally, we found a copyright free F image! This block letter would work for rubber stampers, scrapbookers and anyone else looking for a picture of a letter F.
There was no artist listed in this compilation of stories by Hans Christian Anderson and published by George Routledge and Sons around 1870. The book was entitled The Wild Swans and Other Stories.
This image is copyright free and in the public domain anywhere that extends copyrights 70 years after death or at least 120 years after publication when the original illustrator is unknown.