I’ve seen a handful of 1704 pesos where the dies look flawless at first glance but a quick look up close shows a tiny mis‑cut around the sword’s tip—exactly the kind of subtle asymmetry you’re talking about. It turns out those were likely second‑cast dies that slipped under the quality check, so the edge got a faint “knob” that’s almost invisible unless you’re measuring. If you can pull one out of the stack, lay it flat and compare the sword’s bevel on the obverse with the reverse; that little bump on the reverse edge is the tell‑tale. It’s a neat little quirk that shows the mint wasn’t quite the exact artisan it’s made out to be.