Thank you and enjoy browsing my store! Here is a VERY old Durosil glass chimney for an antique oil lamp. I think this was hand blown. The glass is wavy and there are multiple air bubbles.The rim edges are wavy too. The really unique part of this is that there are 2 widths. I call them fat and thin.
You can clearly see this in the first 2 pictures with the ruler as a scale. You can see the bump looks wide from one side and thin on the other.
I did not see any damage. I DID NOT CLEAN THIS. IT NEEDS TO BE CLEANED, BUT I LEFT IT AS I BOUGHT IT.IT WILL BE MUCH MORE CLEAR AFTER BEING CLEANED. Please see pics for more details. I CANNOT CHANGE IT OR REMOVE THE OPTION.