Your blade is similar to that of the Dragoon sword made at Toledo about 1761 to 1780.
Ferdinando IV of Naples was son to Carlos III of Spain. Carlos III was previously king of Naples where he erected a weapon factory at Torre Annunziata in 1758, built by the architect Sabatini. When Carlos came to be king of Spain, he repeated the concept in Toledo from 1761, with the building again by Sabatini (1771).
I wonder if the Due Sicilie inscription was added later.
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