Iridescent Kralik Banded Tapered 6 "/ Wilhelm Kralik Sohn, Eleonorenhain / Circa 1900
From my parents estate. In excellent condition beautiful green irridescent glass with banding.
If you hold it up to the window in a dark room and let light shine through the inside (see above pic) it's a plain bottle green with grey swirls. Take it into a bright room and it lights up with a rainbow of iridescent colors.