Thanks - it's a real conundrum, i've spent hours and hours on websites trying to match the signature and style.
I recall seeing something similar at a website dedicated to Murano glass but i haven't been able to find it again.
I've seen solo Ercole Barovier signatures and the 'r' on the end matches but all i've seen have had a lower case 'b' - so i'm officially stumped.
Alexander