Scotland
Rothsay Mills Counterstamped 4 Shillings 6 Pence 1820 AG3 PCGS, KM-CC100. "Rothsay Cotton Works 4/6 1820" counterstamp upon Mexico War of Independence 8 Reales 1814 Zs. Host coin is About Good, counterstamp is Good Very Fine. A fairly scarce type, with an even scarcer use of a host coin.
Estimate: 1200-1500 USD