Can't help on value/price, but I know there is/was at least 2 other members that collect them. I have a few but I'm not targeting them right now but will pick them up when ever I find them at my LCS.
I have some two feather Buffalo nickels, but I agree, they are hard to price. This is probably because the demand is unclear. Certainly, condition matters. That 13S T2 2 feather should fetch a premium because it is so nice. It also depends on what the population is for various date/mint marks for the 2 feathers. Some years/mint marks might be rarer.
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