Another thing that's clear about it, is that it's a scale-buster.
I've never seen one quite like it, but since it's got 'Blank for Concaving', I have to assume it was made for the barbering trade to modify as they saw fit, and someone thought that behemoth would fit into those dainty little scales.
If it were mine, I'd give it a few strokes on the butcher's steel and use it for prepping ribs to be barbequed.