Whiskey decanter set with stopper and two glasses in glass or crystal

Description

This is a decanter set for whiskey, bourbon, or other alcohol. The decanter comes with a stopper and two matching glasses. Not sure if it has ever been used. It is made of either glass or crystal. An internet search shows an identical decanter being sold under the name of "vintage Mikasa crystal", but I have been unable to verify if this is accurate. This set has no identifying marks on the glass. This is a very nice set - decanter and stopper are rather heavy. No chips, cracks, or scratches. The edge of the stopper bottom (the part that goes inside the decanter) looks worn on one side, but it appears to be how it was manufactured. The top edge has a small imperfection that is about the size of a period, but it is hard to tell if it is a blemish or just a small bubble near the surface of the glass. Both of these can be viewed in the attached photos. The decanter is 8.5 inches tall (12 inches tall with the stopper inserted), 4.7 inches wide, and inches deep. The glasses are 4 inches tall and 3 & 3/8 inches in diameter.