Rare William Thomas Staniforth Sheffield Ascend Cutlery Works Pocket Knife

Heavily used and sharpened.
Both blades still have decent snap and good half stops.
Small amount of side play.
I think the handle scales are some kind of horn but I can't tell for sure.
There is a crack in on a handle scale near a pin.

overall length open: 6-5/16"
main blade length: 2-5/8"
closed length: 3-5/8"

Condition as pictured.