That isn't abused, it is simply used extensively and worn from sharpening. You have to remember that guy wasn't a collector, he simply used the knife and kept it sharp. It is very common here to see knives which look like that, as an example :
See the heavy recurve in the top blade and the hint in the second one. These are knives used by a family of tradespeople. They will stay in the kitchen, then go out to fillet/split/tongue fish, then go in the garden, and then in the shop for utility work. Even with this use they still usually last more than one generation.
These people don't have a pile of knives that get rotated and they don't hesitate to use knives as they buy them for that reason.