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DMD I would go with the two easiest and non-damaging suggestions on this thread to start with...
Look at the edge under bright light and magnification....
Give it some laps on a .50 Cr strop if...

The best way to find an overhoned edge is actually the TNT but it also can dull a perfectly good edge, so I don't recommend it's use for testing for an overhoned edge...

I would look under a...

First I gotta ask what kind of blade is this???

Second it is not really all that easy to overhone most edges, it takes two things really either pressure or an excessive amount of laps to actually...