I don't know too much about katars but that one is beautiful!
But... my gut feeling is that it was owned by a rich man who maybe did not fight often with it... after-all, with all the decorations and carving... getting the flesh out of the holes, chiseled parts, and furrows will take more maintenance than a "normal" katar, hehehe... or perhaps being a rich man he had more time/servants for such things?
I don't know...