I've had a good search through Google results and the only mentions of this BOHM KRISTAL signature in relation to glass are of the ebay one mentioned above on various ebay and related sites across the world.
There was a famous glass engraver called
August Böhm (dates 1812–1890) but he was obviously not responsible for this piece as it's not engraved, and all his pieces normally carry a signature with his name, place and date, and the time-frame is wrong. This is the only other mention I've found with Böhm and glass/crystal connections.