Vintage Cut Crystal 5" Vase.  It is in excellent condition - looks like it was never used!  It may be RCR Royal Crystal Rock.?  It was purchased from an estate sale and she had other vases similar to this one that was by RCR.  It measures 5 1/8" high and 2 3/4" diameter at the top.  Hexagonal shaped with round interior.  Please use pictures as part of the description.

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