From the image, this appears to be American Brilliant Period cut crystal, or ABP from the late era of the style (circa 1900). It is a mix of mold blown body and cut surface decoration. Sometimes these are signed or marked on the underside, either with a hand etched signature incised into the surface, or a very small acid-etched symbol. If not signed identifying the usually a challenge, hence they fall under the category of ABP for most collectors. The market is a bit flat on these at the moment; the high sale price would be in the $70 - $95 range on today's market.
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