1899 Peruvian dinero: the mystery of a coin that wasn't officially minted

It's basically a counterfeit coin, but for a moment my imagination was sparked by the idea of this being an accidental trans-dimensional artifact from another version of our world.

Dupe https://news.ycombinator.com/item?id=38910965

Not really. One is a news article, this is the paper the article is based on.

TL;DR: Its a very old counterfeit coin.

Yup, that’s what the title indicates…

If it wasn’t minted, that leaves one option…