Some things I notice about the heads on this sword which may or may not have significance;-
William and Mary were made joint monarchs, but only one head is crowned.
The crowned head is on the inside of the guard when I would have assumed, being presumably the more important, it would be on the outside.
The head on the inside of the guard appears to be the wrong way round i.e. with the crown towards the grip. Certainly both heads are not the same orientation.
With respect to the fleur-de-lys see attached
https://www.bonhams.com/auctions/246...ngth=90&page=1
Regards
Richard