| StM blade numbering
A few weeks ago, I noticed that my FIE StM foil blades have a two-digit number stamped on them above the "StM" logo (which is above the FIE mark). One digit is positioned above the "S" and the other digit is above the "M".
A few of my blades have the numbers "11", others read "09", and I believe there was a third one too.
Does anyone know what these numbers mean, if anything? Are they a lot number, month of manufacturing, or some kind of stiffness/flexibility rating?
Thanks,
Dan | 
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