Brinckerhoff, Sidney B. and Chamberlain, Pierce A., Spanish Military Weapons in Colonial America 1700 - 1821 (Harrisburg, PA: Stackpole Books, 1972) shows some blades very similar in form to yours and dates them to the early 18th century; remarking this blade form is very common in the Spanish colonies.
I suspect the form may have continued to be made after that, probably well into the 19th century. European 'trade' blades with the three narrow, shaller fullers are also seen in takoubas, kaskaras and even Scottish basket hilts. I agree that the eagle on your example surely suggests Mexico.
The engraving on the blade and the form of the hilt would probably be your best clue to the date of assembly. Looking closely at the grain of the metal and presence or absence of grossly obvious inclusions might help you decide if the blade is earlier or later. Look also at the mounting of the blade into the handle to assess whether it was likely assembled de novo or incorporated an earlier blade.
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