This style of this flask was developed at The Pitkin Glass Works of Connecticut in the late 18th century. Richard Pitkin was the first US manufacturer to use the half-post method in which a gather of glass is dipped into a pattern mold, then dipped again to cover the front-end, or motif side, of the bottle.

Pitkin flasks are distinguishable by their glass color, which marks their origin of production. Original Pitkin’s flasks are olive or light green, but flasks from Midwestern glasshouses, like the Louisville Kentucky Glassworks, were made with aqua colored glass.

Sources:

More Bottles in Archaeology

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