INVERTED DIAMOND POINT (AKA) by Boston and Sandwich Glass Company (Operated: 1825-1887), Uncertain
NOTE: Sid Lethbridge - There are two versions of this pattern - one with a bullseye or thumbprint inside a large diamond and one with just diamonds like this one. Speculated to be Boston & Sandwich based on shards.
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Contributor: Margaret Cronk
Contributor: Sid Lethbridge