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Aqua sea glass found in the United States that it can be dated from the last quarter of the 19th century to the 1920s. Though the color is still manufactured today, it was mass produced in greater quantities during these decades and saw use as Seltzer mineral water bottles, medicine bottles and ink bottles, and more rarely, even as beer bottles. If it’s machine-made and light to dark aqua, this time frame is a safe bet.