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Gabe i owned all the stones before, your stone is identical to the square sized Goldfisch i had. So for me its clear! As mentioned above it might be just the natural difference within the layer...

Thanks for clarifying Peter, as mentioned by email my idea was just that the middle part of the Lorraine Layer does appear different then the Outside layers....

So this could be the factor that...

Looks the same from the sides like my "La Lorraine" and my "Goldfisch Wetzstein"
https://farm6.staticflickr.com/5470/17907459330_ac84dda551_c_d.jpg