Thanks for the quick replies - it is glass ( I tapped it with a knife) and I am pretty sure that it's not a burst bubble. I emailed the seller and asked him if he knows if it has been repaired. The color of the glass appears to be exactly the same as the rest of the bottle.
Cindy - I agree w/ Lobey ...It looks like a repair in the mold itself. I've seen this w/ many demis and other blown bottles. This only adds to the beauty of each piece, I feel.
Thanks Meech - I really appreciate the quick replies because I opened the bottle and immediately had an anxiety attack thinking I'd been taken - I paid a lot less than what these usually sell for, but I really think repairs should be disclosed, or I might not have bid. A mold anomaly is okay with me. Here's the bottle.
I agree with Meech & Lobey ! A mold repair !
A small hand held blacklight is a good investment to detect repairs. This will put your mind at ease on future purchases . I see some that are quite reasonable selling on ebay. If I can find them ..... I will post the link.