Wow those are some GREAT ONES . If anyone is selling any, or knows someone who is, please let me know . Can you imagine if someday I had a collection of 50 birdswing bottles? That would be a collection that even the big money guys couldn't top Thanks for taking the time to post the pics!
Well all of you, I just stumbled onto this thread. I will need to come back to it if I can find it tomorrow, because the glass pulls from internal contacts are not all bird swings. They are however a swallowing hazard if they break loose and come out in some food or drink. The ABM bird swings are easily caused by the inversion of the parison form from the blank mold to the final blow mold. Also on the ABM machines doing press and blow can have a hot tipped plunger pull a spike down inside the parison form that will end up as a spike in the center of the jar being made. Modern inspection equipment catches all most all of them.
Your pictures show some anomalies in hand blown products. These can be very interesting to analyze. These glass pulls were caused when the inside of the product being blown had two points of hot glass touch each other and pull the strands pictured.
As for the large piece of glass in the flask - that is a good stump-er.
I will try to get back. RED Matthews
I dug this bottle the other day and it was filled with dirt. When I took a bottle brush to the inside, I broke the birdswing. The effect was 2 birds with long beaks, one right side up and the other upside down. To me they look like hummingbirds. I really like the bottle.