Watch List notes:

Potosi, Bolivia, cob 4 reales Heart, 1707Y, extremely rare. S-P43a; KM-unl.; CT-1074. 13.93 grams. A beautiful work of numismatic art, perfectly shaped and balanced with both crowns in top stem and with legend date and king's ordinal V in bottom tail, all inner details bold and centered and well struck (no doubling), beautifully toned XF with contrastingly toned fields, small neat hole at top. This denomination is particularly elusive in Hearts, with only about 15 pieces confirmed (among several pseudo-candidates that were probably just cut-down Royals) across all the known dates.

Estimate: $25000