Hi James, Just seen your message on my wall...a piece like yours is a special piece especially as its signed twice..however most dedicated pieces lose a little value as most collectors like to frame etc

I've seen items go for anything from £1000 to £3000 however its also how long youre willing to wait too...realistically imo and I'd say anything up to £2k with a view to negotiations is fair...but again it would be worth that with authentication so maybe thats something to take into account when selling.

Roger Epperson is a favourite TPA of mine.

If you go down the auction route bear in mind you'll also pay auction house costs..like I said, I'm interested..have a think and let me know once you have a price in mind. 

All the best

Phil