Scavo is a method of imitating the effect of glass that has been buried for an extended period of time, that is, glass that has been excavated. It was developed in Murano but has been copied extensively elsewhere. I would guess that your piece is one of those copies.
Can I suggest you post the pictures directly to this Board and make them just a little bigger. That way the photos will be kept safely attached to the thread.
PS Here are two scavo pieces from Murano. The blue vase is from Cenedese and the bowl is from Barbini.