Funny thing is the lady offered the silver and gold to me for 20k. But I countered with 12k for both. She politely declined and said she would be sending them in to Clink to auction. I thought great because as Tony mentioned above these have all been done through private transactions. I needed a recorded sale price to happen. I fortunately own two Gold. Number 6 and number 10. Each graded 9.2 and 9.6 respectively. No one had ever seen the back sketchon number 10 until last year. It is the last book in that set and in my opinion has the best sketch on the back out of the nine that are known to exist. 5/10 seems to be a mystery.