NGC 6504 sure looks like one to me. Notice the odd outer halo that is
the same thickness everywhere around the brighter inner core and disk.
A very odd edge on galaxy about 200 million light years away. If I did
the math right that makes it about the same size as our galaxy to
slightly larger. It's "flying" through a rather empty area of Hercules.
14" LX200R @ f/10, L=4x10', RGB=1x10' binned 3x3, STL-11000XM, Paramount ME
Full image is at: