Hellol DIGGIN DOG; I am fairly certain it was before 1900.
It is what is called [ A Straight Tapered - Applied Finish ]. After the bottle is blown ( in this time frame ) it was fastened to a empontiolling punty,
or to a previous blowpipe glass neck glass end on the pipe.
This first punty would have hot glass on it, or other empontilling combinations and create a rough contacting hold on the bottle so it could be removed from the creating blow pipe. In the case of the previous blow pi-e use the bottom of bottle would have an open pontil on it.
After the bottle was empontilled it now has a handle to work on it with, and the bottle maker could pt a ribbon of glass around the neck. Next he would have used a neck forming tool which woulf fit in the neck and closed on the hot applied ribbon of glass to give create the straight tapered finish.
That wooden center plug on the tool is what created the strange marks in the neck, more than likely because of the wooden tip was burned from the previously tooled necks.
Well DIGGIN DOG; I was going to tell you in my post that I thought your bottle finish no doubt rested on top of a wine or a whiskey bottle. The chances are it would be a wimple straight sided cylinder bottle and with a cupped bottom having a company identity around it or a pushed up bottom if it was a wine bottle. I am equally sure it would have had a pontil marked bottom. Dig in the same place and you might find the shards. REE Matthews