If honed properly, the shave would amaze you, IMO.
I've cleaned up and honed a few, all have given some of my best shaves in comparison to modern steel.
I beg to differ. Shaving with these antiquities, especially in such worn out condition, is simply a novelty in my point of view. The thing is practically a toothpick! The quality of shave doesn't compare to say a modern full hollow with a tiny bevel.