I have a pink mother of pearl chip with a 20 denomination on one side and a crest with CON LIBERTAD and two other words I cant totally make out on the other parts of the square crest. It has a C on each side of the crest and 510 at the bottom. Can anyone tell me where this is from or give me a link to see if I can find it? I found it in an antique shop and thought it would make a good necklace medallion (it does, i get tons of compliments/questions on it). This style of collecting is addictive! thank you!