T206 Rarity multiplier ?

[NATCARD]

I have a question for the T206 Experts. I have been in the business 45 years and have owned a Wagner but do not consider myself an expert at all on the backs/multipliers for T206's. I have recently bought a collection and had them graded. My question is this: Most of the Hall of Famers are Sweet Caporal 350-460 Factory 25 which on most lists I can see, and have, this back is ranked 19-21 out of 28-41 different backs depending on the site/list. (About the top 50%) I am looking for the value of these cards in terms of multiplier vs. the most common of backs. I will give you an example : T206 Christy Mathewson Dark Cap SGC 3 Sweet Caporal 350-460 Factory 25. (Yes this lot will be posted for sale on Net54 soon, before I list it anywhere else). Looking for value.