Unusual Production Flaw

[Dug]

I recently acquired an early 1900s local pharmacist bottle. It had some minor sickness so prior to tumbling it I cleaned it and looked it over for pot stones or near surface bubbles. The letter T on the embossing caught my eye and I was trying to figure out if it was a potstone but when I looked closer I saw a long spur of glass on the interior of the bottle on the backside of the letter. This is a first for me so I thought I would share. No clue what could have caused this anomaly during the production.

Seems like a good way for a customer to ingest a piece of glass if they shook the bottle up too much before consuming.

 

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[sandchip]

That's bizarre. How it survived breaking off for over a century is beyond me. Can't figure how it would've formed during the blowing process. I've see a lot of "bird swings", usually in early umbrella inks, but that's a different thing.

 

[Dug]

I have a Facebook acquaintance that believes it may be cullet, which he describes as a form of recycled glass being used in the mold as being the culprit.

 

[gleaner1]

It happens somehow. I have a couple variants, I will try to dig one out. Known as "bird swings", here's a nice full one. Mine are pointy and razor sharp too, not a full loop. Anyone else have an example?

 

[gleaner1]

A quick interwebs search indicates that in order to be a true bird swing, it has to connect at both ends in a loop like the ink.