I agree Cesare, we look forward to more of these amazing treasures. Who knows how many mysteries lie hidden in them, very much like the mystery of those blade markings on this one!
While the answer to the markings on this blade defy our attention, perhaps new mysteries will have more results in our discussions.
A note to Dmitry, thank you for your notes from the Boccia & Coelho reference! I had meant to include that but got lost in my ramblings (as usual

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All best regards,
Jim