At your convenience, please send more images of the signature that is visible in photo image #4.
Thank you for the image, I would really need to see a more clear, in-focus image of the signature in order to decipher this for you and determine the maker and value. Please send clear close-ups of just that signature from different angles. When taking a clear close-up try using the macro function on your camera. It looks like a small flower icon. This will allow sharper focus at a closer-range.
May I know how the appraiser you worked with came to the conclusion that this is Italian Murano glass?
This is not Murano glass, it is signed studio art glass and it is dated 1983 although the signature is illegible. The numbers are an in-house inventory number and cannot be traced to the maker. If you would like to try to send more images of the signature, I may be able to decipher it. The images currently aren't quite capturing the whole name on this to make it easy to decipher from the provided photos.