Spain
Seville, Spain, 4 reales, Ferdinand-Isabel, assayer * twice on reverse, legends ending in DEI GR and ARAG.Cal-562; Lopez de la Fuente-unl.13.76 grams.Exceptionally broad flan that extends beyond the outer borders, with choice full inner details and 100% full legends (the latter somewhat grainy from either die-rust or oxidation), trace of toning, tiny edge-splits, AU, this specific variety not listed and possibly rare.
Estimate: 350-500 USD