Watch List notes:

Costa Rica, 8 reales, 1846JB "2R" counterstamp (Type V) with "8" countermark on a Potosi, Bolivia, cob 8 reales, 1771(V-Y), extremely rare, ex-Richard Stuart. KM-unl. 26.48 grams This counterstamp (intended for 2 reales but used on larger denominations with a supplemental denomination countermark, like we see here) is very rare on 8R cobs but apparently unlisted on a Potosi cob this late (as KM-58 refers only to Philip V host), with counterstamp typically weak but readable (Fine) and the countermark bold (VF), the host Fine with full but partially weak cross and pillars-and-waves, date and both assayers clear, nicely toned and remarkably NOT holed. Pedigreed to the Richard Stuart collection.
($8000-12000)