These are current Charlton catalogue values for VG:
1906 $5 (14-08a) $1,500
1906 $10 (14-22) $1,350
1906 $20 (14-36) $5,000
1907 $5 (14-10) $550
1907 $10 (14-24) $800
1907 $20 (14-38) $5,000
1912 $5 (14-14) $350
1912 $5 (14-14a) $375
1912 $10 (14-26) $1,300
1912 $10 (14-28) $500
1912 $20 (14-42) $750
On a personal note, Rog, I well remember your TV show. They don't make good ones like that any more.
If you are planning the kind of outlay the numbers suggest, you probably need to get the book. If you are selling, I'm interested in some of them.