Mexico
Republic 8 Reales 1840/39/1 Do-RM/L XF45 NGC, Durango mint, KM377.4. Do-17 variety. Struck with clashed dies, this is a most interesting example that features a plethora of interesting elements: an overstruck date, an overstruck assayer, and a horizontal "R" under the "R" in Republica. Listed as extremely rare in Resplandores.
Estimate: 400-600 USD