Roger, yay! PLZ do not dismount the sword.
As noted by Fernando, this blade DOES look remarkably Spanish......so hard to say. It was not at all uncommon to have small swords mounted with rapier blades in 'transitional rapiers' which were essentially small swords with rapier blades end of 17th century (Egerton Castle, 1885).
The hilt is undoubtedly English, Matthew Boulton style as noted (Aylward, 1945).
I think we can say this is most certainly an English cut steel hilt of 1790s mounted with 17th century rapier blade of notably Spanish style and what appears a spurious use of the name SEBASTIAN HERNANDEZ.
Beyond that, not sure what more can be said.
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