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Yeah, I wouldn't have known either if I hadn't seen really close up pictures of them. I think with mass manufactured DE blades it's easier to go in shallow to get an edge roughed out, then come in a...

Others have pretty much hit the nail on the head. That's an intentional secondary bevel on the DE. What you have on your blade looks like either a burr/foil edge, or an unintentional secondary bevel...