Thankyou Gene, Manuel and David. Things are now getting interesting, but still no conclusive result.
A couple of things to be clarified.
This sword is not what I would call a true "double edged" item as the edges are not, and appear not to have EVER been sharp. It is the point which is sharp.
The raised rib on the blade is on BOTH sides, and does not have the concave "mate" as per discussion above.
I have attached better pics of the hilt, and the apparent "vice" marks are as a result of the orginal casting marks and a BAD pic---sorry guys!
The "washer" is in fact part of the casting of the guard and not a seperate piece. There is no washer of any sort at the top of the pommel.
Yes the brass has been cleaned at some stage as there is the telltale powder residue in the grooves, and the leather gusset shows no sign of being against a scabbard mouth.
Whats next??
