Some guy tried to sell me a 1800's 90% silver Sol but for a ridiculous amount, he could tell I was interested in coins cause I'd been glancing at some on nearby booths, took me 10 minutes of shooing him away before he left me alone. Quite an interesting/annoying market. Anyway, my question is, even though I'm thinking it's highly likely counterfeit, any chance this is real? If not, I somehow managed to find a fake coin in a random marketplace in one of the counterfeit capitals of the world. I guess if it is a fake, that makes it a "realistic" souvenir?
21mm diameter, 3.43 grams

Just looking for verification. This is indeed counterfeit?