[ S152 ] Very unusual sword no idea exactly what it is

Description

Very unusual sword .i have no idea exactly what it is, the blade has a number & a makers mark, a friend of mine thinks the mark it Italian, its not modern , definitely an antique piece ,may be Victorian era ,may be older , its similar to a much earlier sword that i have seen which was all iron,
The Hilt is gilt brass with large swept arms terminating into bulbous finials , a lot of the gilt still remains especially in the protected area's. the double fullered blade is beautifully formed. the tip is slightly rounded but quite minor.On the risacco there is a number stamped on one side & a crown & something else on the obverse side. the sword is around 70 cm total when in the scabbard,out of the scabbard it is 66cm .
Scabbard is brass mounted leather with excellent stitching to the leather, To me i think the sword appears to be French in origins.A very well made item which i cant say for sure what it actually is.
Price-$1475