It can be hard to tell the models apart. The 1833 had a smooth rounded quillion so this is one of the earlier versions with the lobed quillion. Without any markings the length of the blade may give you a clue.
Model IX 1800 Blade: 65cm long and 5.1cm wide at ricasso
Model X 1801/2 Blade: 75cm long and 3.9cm wide
Model 1811 Blade: 67.6 long and 3.65 wide
These are much rarer than the 1833.
David
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