Ah ... now we have to distinct provenances; and may i guess the blade might have been shortened from a sword (rapier?) one, both due to its unusual (?) tapering and mainly due to the advanced position of the makers mark
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A mark that doesn't appear to be Spanish; none of the Toledo smith marks in the Palomar chart seem to have such symbol and those are usually puntched inside an estucheon. Didn't find it in Wallace Collection book, either. Maybe Italian ?