1516-1556 Santo Domingo 4 Maravedis?

@Tommyjet, I think that you are on the right track, but to pin it down more conclusively, please post new pics with the coin not in the 2x2. I'd like to take a closer look at the three letters around the fortress on the obv. as well as try to make out the rim legends on the obv and rev. Also, please post the diameter of this coin--the diameter of the 4 maravedis is about 27 mm.

@Tommyjet, thanks for providing the better pics. As you probably know, coins of this basic design were used for a number of rulers in the late 1400s and into the mid 1500s. Some of the details that changed from one member of the royalty to the next include the shape of the scallops, the number of lines in the scallops, and the design of the fortress. The letters next to the fortress also vary a bunch--I'm pretty sure that sometimes they indicate the mint and at other times indicate the mintmaster.

On one hand, I'm pretty sure that I see a letter P and a letter S to the left and right, respectively, of the fortress. This could be part of an F-P-S inner legend, making your initial premise correct (and the exact attribution for your coin Clemente & Cayon #3027).

However, I'm not completely convinced that your coin comes from Carlos I because the scallops seem to be more pronounced on your coin. Also, it seems a little odd to me that the diameter is still 27 mm and yet so much of the outer legend is missing because the rim has been trimmed away or else the die was meant for a larger flan. Finally, it looks like the P is sideways, which seems odd.

I'm not questioning whether your coin is real or fake, but it does have some characteristics which are not that suggestive of a 4 maravedis of Carlos I. I've looked for a match of your coin starting with the Catholic Monarchs (Queen Isabella I and Kign Ferdinand II) and proceeding past Carlos I ending at Felipe III--and I don't find your exact coin. Perhaps you have a variant of C&C #3027. I am just not knowledgeable enough in this area to know how consistent the die cutters were in 1500s Spain...

no prob. glad to help!

You know this post is 4 years old, right?

A little late to the dance perhaps, but it is always nice to have an expert weigh in and fix my errors.