flaming blade old dagger

[fernando]

I need some help, please.
This is one of two old pieces i bought yesterday in a little country "antiques" shop.
I am not sure if "flaming blade dagger" is its correct name in english, which then would be the strict translation of portuguese "adaga de lamina flamejante".
It has a very strong blade, 9 1/2" long, and is over 5/16" thick, slightly reducing to the tip. The wood handle is slim and of less strong concept, with some basic turnings. Also very fragilised, as mostly worm eaten in the inside. It has a 1/2"brass ferrule, almost completely dirty and oxided.
Could someone help to classify this dagger, in terms of tipology, possible age, and major use context ... military or personal defence/ofence.
Or eventually any other remarks that may occur.
Thanks a lot.