Watch List notes:

Seville, Spain (special issue struck for the Americas), 1 real, Ferdinand-Isabel, mintmark S to left, ermine to right, very rare. CT-unl (224 for Type). 2.50 grams. Broad, thin flan with 100% full details (including legends), unlisted variety (even missing in the exhaustive Lopez de la Fuente reference) with S-ermine as opposed to ermine-S, clear crowned F on reverse ("efe coronada" in Spanish) to denote a special striking (1505 decree) for importation to and use in the Americas, toned XF, inexplicably underweight.
(1500 - 2250 USD)