Hi, are you still looking for information on the "union dressing" bottle? I just found one as well, and cant find anything about it on the Internet with the exception of your post. Where I found it, though might give a clue. In a small Pennsylvania town, there was a paper mill called the "Union Papermill" that made wallpaper from 1865-1887 when it burnt down. Since there don't seem to be many of these bottles, I am thinking that maybe it contained something produced on site at this Union Mill. This is a guess and may be a stretch, but I think possible. By the seams and molding of the bottle I am guessing it would date to the early to mid era that the mill was in existence. Where did you get your bottle? Hope this helps