I could be wrong, but it seems obvious by looking and dating, by looking at the tang and shoulder, spine, lack of wear on the spine. I would say it was reground at some point to this taper we see. Someone either wanted it tapered, or screwed up, chipped it, and made it that way. I think I see a frown. Needs some profiling? I think I see 6/8 on the tang? There you have it! Should be a good shaver!