Murano Art Glass Crane Birds

A pair of Glass Crane Birds believed to be Murano Art Glass, no sticker or identificable marks are found on the items.  One is 14" tall and weighs 5 lbs 2 3/8 oz, the other is 17" tall and weighs 6 lbs 9 1/8 oz.  Item was probably purchased in the 1950s or 1960s.  They are definitely hand blown since small bubbles are visable when you look real close.  Would like to obtain professional opinion on whether these are Murano Glass or not and their value.