Wow! You are quite fortunate to own one of these. I suggest you contact Corey at Floyd Authentic and he could likely provide you with potential value and the best selling solution. Here is his web site address.
I would like to keep it but need the cash at the moment.
I did get to see the Syd Barret tribute at the Barbican where David, Nick and Rick played Arnold Layne and that's a memory of Syd that will stay with me forever :-)
(plus Captain Sensible covering Astronomy Domine was amazing !)