It looks like CLEMENS KEULLER on the ricasso , spelling was phonetic in this period and most people could not write.
We also know that the letter U was mostly engraved or struck as V.
So I think there is a good chance it is on one side " clemen(s)" and on the other side "keuller" CLEMENS KEULLER . Not all sword / rapier blades have markings, so you have this as a plus. ( from European makers of edged weapons by Staffan Kinman )
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