Hi Gene,
AFAIK, the design cast into the backstrap is consistent with the P1845...
Question though - I see a break in the ribbon bar of the hilt closest to the lens (in the 2nd photo). Is there a break in the bar, or does the sword have a folding counter guard? IIRC, the folding guard was dispensed with in the P1845...
Is the portepee original to the sword?