So it's some voodoo dark art then, thanks guys.
My pappy never mailed his knives anywhere to get 'em sharp.
Fine diamond crust triangle file with one corner a fairly sharp angle sounds like a plan. Thanks for that idea, Strings.
Other side shows the wear/asymmetry better. Fix that up and it'll probably stay good for quite awhile.
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What I'm calling "bread knife" serrations are the type you sharpen with a round or conical stone.
This is the opposite of that shape, like how a mold is the opposite of the shape it's molding.
There must be different names for different types of serrations, even if it is just convex and concave before you get into the details of radiuses and symmetry .