Vintage Foster Bros. Goldstar Carbon Steel Butcher Knife

12 inch blade, Fine Patina, Never washed with harsh detergents,
Never polished or refinished, Ebony handle with Goldstar rivets, No scabbard, and I don't believe it ever had one, Very sharp, I have no use for it, This knife belongs in the hands of a collector,
 Knife is believed to be well over 100 years old , Knives Carbon Steel, Goldstar Foster Brothers

Knife is for sale.

I know what a knives like this are selling for but I need need an appraisal anyway.