AM 5 = 8
AM 6-8, 12, 13, 15, 19-24 = 6
AM 9, 25, 26 = 7
AM 10, 11, 14, 16-18 = 5
THIS IS FROM THE GERBER PHOTO GUIDE: A 1-3 COMICS ARE MORE COMMON THAN AVERAGE (AVERAGE IS 4) 5 IS LESS COMMON THAN AVERAGE, 6 IS UNCOMMON, 7 IS SCARCE, 8 IS RARE, 9 VERY RARE AND 10 EXTREMELY RARE.
LESS THAN AVERAGE: 200 TO 1000 EXIST
UNCOMMON: 50 TO 200 EXIST
SCARCE: 21 TO 50 EXIST
RARE: 11 TO 20
VERY RARE: 6-10
A '10' IS FOR BOOKS WHERE THERE ARE 5 OR LESS KNOWN COPIES
*SO UH, TO FOLLOW THAT LOGIC UP, IF YOU HAVE ONE OF THE 50 LEFT AND YOURS IS A 9.4 THEN IN FACT YOU HAVE BECOME GOD AND NO LONGER NEED TO PAY YOUR TAXES.