Awesome coins! I've been working on a type set for about 1.5 years now, still a long way to go. I don't have the KM430 10 Centavos yet but I have the 20.
The original coin here is a pretty good one. There's not many for sale on eBay right now and the one I see that's closest to your condition is listed at $54. That's kind of high but nevertheless it's a good coin.