I think this is my favorite vintage letter O drawing. It has a literary look about it with the scrolled edges and is clearly the letter O, even if resized a little smaller. It has a number of design styles incorporated to decorate the letter O itself as well as the scrolls which surround it.
There were so many wonderful illustrations in Hill’s Album of Biography and Art. The 1882 work by Thomas E. Hill has provided more vintage illustrations for Reusable Art than probably any other resource I’ve found.
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.