Worn Edges with noise

Anyone know a easy way to set up nodes in cycles to make the edges look worn like this but in not so perfect a way. Variation???


It helps to think of the edge wear as a mask rather than part of the material itself.
That way you can concentrate on just building some interesting variation between black and white along the edges. Once done, use it as a factor mixing between a completely clean material with a completely dirty/scratched/warn/faded/etc version. The added bonus is that you can easily adjust the mask to reveal more or less damage.

Here’s an example of just the mask/fac portion:

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