Guatemala (countermarks and counterstamps)
Guatemala, 4 reales, sun-over-mountains countermark (Type II, 1839) on cross side of a Potosi, Bolivia, cob 4 reales, 1739(?)M(?).KM-unl (85 for type).13.29 grams.Nearly full (AVF) countermark on upper half of VG host's cross below tiny hole near edge, other side with full but worn pillars (medal aligned) with partial assayer and date, this exact host type not listed in KM, toned in crevices.
Estimate: 150-225 USD