hello and welcome to the GMB

Sorry, not a clue is the answer to your question, but would just add that very unlikely anyone here will provide you with a value, which of course contrary to your countrymen who are usually very forthcoming with valuations. We all buy pieces occasionally in the hope that the piece has value, which assume is why you've acquired this pussy, though unfortunately it doesn't always work.
Even if this one is a replica only, it's still a good looking cat, and worthy of a good home.
Regrettably not remotely my area, but in view of your comments you're obviously aware of similar Murano/Da Ros pieces, though it appears from the lack of replies there may be few here who follow your passion. As a matter of interest are you able to say what 'some of the features from an Antonio Da Ros piece' are, and have you floated your question on any of the States glass forums?