I have a blue mason jar with air bubbles and the number 13 on the bottom but there is no logo on the jar itself. This is not a case of it being worn off, it apparently looks like it was never embossed. It is not perfectly round, you can see some warping on the side (pics 4& 5) and the seams on the sides go all the way up the neck. Lastly, it does not have a normal lip, it is more of a "neckless" jar. Is there a way to confirm if this in fact is a Ball mason jar and the approximate age and if so how common are these? Thanks in advance!