If you are referring to the "Twin" symbol, it is reserved for the company's high-end knives and is actually considered one of the oldest trademarks in the world.
I know what you are talking about, the little chess board thing where some of the squares are filled in. I would like to know has well, I just figured they helped differentiate the blades in the factory during manufacture.
I never knew for sure, but I did work with them every day. I noticed that not all of the patterns were the same. I just assumed it was some way for them to ID what batch a particular knife was from, or what year or something. You know, so if it turns out a batch from March of 2002 suffered really poor heattreats and ended up super brittle, they would have a means of finding knives from that batch and removing them.
We sell those Zwilling J.A. Henckels,and the 'chessboard' is indeed to identify what year and what month they were made.
Be aware though that Zwilling is not producing any knives anymore in Solingen, Germany.
Almost everything they sell is made in China nowadays, and their Cermax powdersteel line is made in Japan.
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