I snatched this one off Ebay two days ago with a Buy-It-Now
price of forty dollars.
The blades are pitted and the backside handle is cracked.
Bruce Voyles showed a Robeson of this pattern in two of his books and called it a serpentine doctor's knife, probably because of that flat bottom bolster. I'm not sure it's a "pill buster", so I'm just going to stick with serpentine jack.
It will display well from the front side.
Very unlikely I'll ever find a better example.
And, forty bucks. Why not?