Hello, can anyone give information about the attached glass vase. It has a sticker which says AHLEFELDT LAURVIG. It is signed on the base MAL. It is blue glass with copper coloured flecks It stands 24cms tall, diameter 6cm top, 7cm bottom. Weighs 927g. I know he is a Swedish artist but cannot find much reference to his glass work. Is it collectable, rare etc? Thanks.