“S” window quartz – Poretta Terme, Bologna, Emilia Romana, Italy
 Acquired in 1888!
 A historic collector's item with original label and collection number from the Alfred Schwab collection, Bern, Switzerland. Some of the heavily fenestrated surfaces have formed a clearly recognizable "S" shape on the prism surfaces.
 This special piece was purchased in 1888! A true historical curiosity.
 An Italian classic in a wonderful execution. The highly fenestrated quartz is beautifully structured and, in addition to the strong fenestration with clay inclusions, also displays high-gloss and water-clear zones.