From the Fenton menagerie of animal figurines, this is their butterfly in White Satin (milk glass with a satin finish). It's ware number 5170 WS which was introduced in 1972.
It's 4.25" wide, 3.25" long and 1.5" tall.
Condition: as new, no wear or damage.
Mark: Fenton logo on the side.
Item ID: 3460