Throughout my career, I have only used two distinctive marks on my recorders. The first represents the interlaced numbers 8 and 1, standing for the initials of my name. This stamp is to be found on the instruments (or blocks) made for Fehr and Marsyas and on some of my own earlier instruments.

The second sign represent two playful dolphins. They appear on both the headpiece and as a sign of top quality on the upper face of the block.

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