Wow, you have 281 different autographs and not Cap Anson? Yet, I digress.
Really depends on the quality of the autograph, I would guestimate $1,000-$2,000. Depending on quality, shorten vs. full name.....
Let me say that in all my years of collecting, I have never seen an authentic "Cut" autograph of Anson, except for the UD insert, so be very careful. He is heavily forged and had several secretarial versions of his signatures that have been accepted by certain TPAs as authentic.