Thank you all for your contributions. It was acquired because I thought it was a pretty piece and not because of any potential value. I thought it was Caithness when I saw it but couldn't understand why no markings, not even C11G. It has joined others in my display and shares a cabinet with Caithness, Perthshire, Strathearn and Paul Ysart and doesn't look out of place.
Kind Regards
John
P.S. I am not a newbie - just someone reaching their dotage who forgot log-in details and e-mail used to register so I had to re-register. Ronnie and I (ex-Laurencekirk) have been members for many years from the days of that wonderful Glass Conference in Perth all those many years ago. User name used to be Zidori.