Marcolin Sweden R3 Konstglas Full Lead Crystal Bubbly Fumato Hand Blown Art Glass Bird Signed Rare Vintage Find Artist Signed On Bottom, Marcolin Sweden R3. Excellent Condition, no cracks, scratches, tiny, tiny fleabite to the beak, has been well taken care of. Same or next day USPS Shipping. A stunning Scandinavian full lead crystal grey + clear glass fish sculpture. Made by FM Konstglas (which later became Marcolin Art Crystal) of Ronneby, Sweden. Signed to base "FM, Ronneby, Sweden, R 3". The feathered bubble effect is usually referred to as "sfumato", which in glass terms means a gradual change of shade, however it has recently been discovered that the correct term would be "fumato", which means "smoked", a technique which involves exposing the glass to smoke from a fire, to give the glass a smoky colour by picking up particles of unburnt ember and ash from the smoke. Measures approx 6.75 inches tall by 4 inches in diameter at widest point.