That is a nice sword indeed especially the blade I to would place it as 17th C ! There is an almost identical one in the Museu Militar in Lisbon that one is described as 18th C, perhaps these are late 17th C early 18th C ? It would be interesting to find out when the first one's emerged to me this is typical Portuguese . Although I collect 16th and 17th C I would not mind having this one in my collection , perhaps Fernando will give me a call around Christmas
kind regards
Ulfberth