Watch List notes:

Leon, Nicaragua, provisional "imitation cob" 1 real, 1823-(P)M(PY), very rare, encapsulated NGC VF details / holed, ex-Richard Stuart (designated on label), KM Plate Coin. KM-8.1 (under Honduras); Jara pp. 31-32. 2.80 grams. Oblong flan with old piercing at top of nearly full pillars and cross, both very bold and nicely set off by deep toning. As the KM Plate Coin for this very rare type, this is probably the most famous example available! NGC #4486419-005. Plate Coin in the Standard Catalog of World Coins by Krause-Mishler, and pedigreed to the Richard Stuart collection.
($500-750)