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Antique Cobalt Blue Hand Blown hobnail poison flask 1830-1860.
Hand blown with a rough pontil scar at the base, a common manufacturing practice of the 1800s.
Distinctive raised hobnail pattern on the front and back faces, combined with ribbed or corrugated sides.
Textured and colored blue glass was traditionally used for medicines and dangerous chemicals so people could identify them by touch in the dark, preventing accidental poisoning.
