I think it's a product of an individual, not from the Buck Custom Shop. Factory Custom Shop blades are marked as such on the blade tang. I've never seen the Buck Custom Shop do file work on the lock bar. Also never seen that sort of handle material offered from the factory Custom Shop. There are quite a few eBay and E tsy sellers doing that sort of thing.

Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats.