@fernando, on many more looks....
Regarding the profuse engraving, the amount of engraving seems similar in length to a Carvalho mark you posted many years ago.
http://www.vikingsword.com/vb/showthread.php?t=6572. The Portuguese were the ones shipping these to India.
And the bottom of the mark on my sword is very similar to a supposed Andrea Ferara mark that is currently for sale and for which I won't post a picture or a link. (My sword is certainly not an Andrea Ferara.)