Hi everyone,

Just joined. Have question about blade size. Have done due diligence in research but apologies in advance if this has already been discussed to death.

I've just come into a Dubl Duck Satinedge in what appears to be all original condition. Measured the blade. It's 18mm from top of spine to edge. In the "The Straight Razor" Wiki 2.2, it says: "an 18mm large blade is called a 5/8." 18 mm = 0.7 inches, whereas 5/8 (0.625) inches = 15.8mm. So why is an 18mm blade not a 6/8 ( = 19mm)???

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