I had someone email me this morning about this bottle. Thought there may be a crack or a deep scratch on the reverse. I checked out the video and I saw something at about the 40 second mark that looked like maybe an issue.
Jeff reported that this is a content level stain line. That's good news, because this looks to be a pretty nice example of this bottle. Also means the bottle hasn't been tumbled. Clean, good "hair on bear". I like it!