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Measuring blade size?

My search fu is off these days, so I apologize if this is a repeat. What's the standard method for measuring blade width? As you can see in the pic below, my W&B has a slight taper from toe (27mm) to heel (25.5mm). So is it fair to call this 17/16 (at the widest) or is it 8/8 (at the most narrow)?

 
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