FOR INSTANCE: There are 13 Cohen varieties of the 1804 Half Cent. I have references for identifying the variety. I have references for identifying the grade. I have references for identifying the rarity. What I don't have is a reference for placing a value on them taking into account those three variables. Extensive research would come up with reasonable values on some of them, but not all. And extensive research takes up a LOT of time. I could use some helpful suggestions.
Greysheet lists individual pricing for all 13 by Cohen numbers in G4 to AU58. They have a separate listing for 5 varieties by generic description in grades from AG3 to MS65BN. This is from the paper edition. They may have additional listings in the electronic edition. All you have to do is pay for a subscription. Or you could PM me.