My thought as well on the espada reworking. I know there were both German and British retaiors selling their wares in the Americas at the turn of the 18th/19th century. This is a curious one, though. Spanish colonial 'bowies' were around, but this blade type more typifies an American pattern. A 'VR' and crown would indicate not only British, but also British military, right? If it was a cut-down blade (very possible as many bowies were made from old swords, files, refurbished utilitarian knives, etc), why does it look so different in it's width. If not for the marking, I'd be inclined to say a bowie-type from Old Spain or American-southwestern. I'm kinda stumped!
I think first we have to rule out that this isn't a 'foreign knife' (meaning no offense, but we know that there are other knives that resemble American bowies). It is definitely not Philippino, as many of the so-called bowies on eBay pretend to be), nor is it a gaucho-type. The broad blade, clipped point and tight line fullers reminds me of Asian blades, but again, that doesn't make sense! The D-guard and grip look right for a classic bowie. Is the VR/crown spurious? I know the GR/crown symbol was 'borrowed' by German sword-makers into the 19th century, so why not this marking? Did Great Britain make a wide machete that could have been this weapon's origin? While Sheffield did inport bowies and blades, the blade on this one looks 'piratey', more Caribbean or Spanish colonial, not the refined work of Sheffield.
I love this piece, but there are still unanswered questions...