G'day Fabrice,
My main area of interest is British swords of the Napoleonic Period, so I am no expert on these earlier swords, but I think you are on the right track. The overall look is of a slot hilt hanger, popular around the American Revolutionary War Period, but the blade profile is not typical for this period and looks a little later. The guard is as you noted very similar to that found on 1803 infantry officer swords. This sword does seem to be something along the evolutionary line that led to the 1803 pattern infantry officer's sabre, maybe circa 1780- 1790?
Cheers,
Bryce
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