I dunno, the blade could easily be in the mid eighteenth century range. See Bashford&Dean for a similar cross section. #66
http://swordlinks.com/courtswords/intro.html
http://swordlinks.com/courtswords/p14.html
Granted that the blade decoration is somewhat different and a different origin. Considering the other roccoco elements, I would not necessarily date the hilt and blade as seperate entities.
Here is a shard of one of those blades I could not resist.
Cheers
GC