Who knows? Mexico FIRST REPUBLIC 8 Reales KM# 377: https://www.ngccoin.com/price-guide...es-km-377-1864-1895-cuid-1117749-duid-1422123.
Probably at least several thousand dollars. Yes, you heard that correctly. MS68+ about anything is gonna be worth a ton. If it's not a commemorative or bullion coin, then it starts to get valuable when it hits 66-67 and many, like some ATB quarters, are worth all kinds of money should you build up a set of just a few. If you own this coin, good luck on getting the most for it!
That coin (2½ grades lower than yours) sold 2 years ago at Heritage Auctions for $9,000, yours would likely sell for at least four times that.You should call Heritage Auctions. Sweet coin!
1864 was the first year of Austrian Maximilian I as emperor of Mexico (1864-1867) That would make it highly sought after
