Image is believed to be in the public domain.
Uploader comment: A vertical cloud with a stem extruding from it's uppermost point westwardly. The next image shows it is a 7 and the 3 is beginning to form the bottom part of the #7. The 3rd images shows it in it's full glory and light! If I can post the video I will, there you see the brightness of the sun reflecting off of this cloud.