This is an example of the importance of makers marks - when such a mark is present - in the entire equation of dating a bottle. It is apparent that the answer to Question 1 is " YES " since this bottle has raised embossing in the form of the "swirls" on the shoulder. A pontil rod held the nearly molten bottle during the final stages of manufacture. Bottle Dating. So at this point we know that this bottle was made in Other diagnostic tools must be used to date these items.
For a broader discussion of this subject see Lockhart, et al.
How to Date Antique Glass Bottles
Click on the base picture for "A" to the upper left and it is obvious that this bottle has mold seams on the base. No additional glass was added to the lip. Other diagnostic tools must be used to date these items. These 3D mold images are combined with drawings of the bottles they produced and highlight the distinct mold seam marks each created. The scar was left when the pontil was detached from the bottle. As the information under this question notes, ACL's in the U. Sheared top bottles are another case where mold seam height is not a good indicator of age.