It is the seal left by my personal hanko, which I created and handcrafted myself.
My gyotaku are sold unframed so that everyone is free to express their own tastes about it. My recommendation is to lay out and protect the washi paper behind glass because it is thin and sensitive to moisture.
The sheet of washi paper is protected between two sheets of stiff cardboard and then enclosed, along with a small bag of desiccant silica gel, in a rigid crease-resistant envelope.
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