This medal about the British/Spanish battle near Cartagena, Colombia. Most of them appear to be heavily worn, with only a few examples in top-notch condition. There are several different designs, all carrying about the same numismatic (coin collector) value.
The best one we've seen is at this CNG page [Press Here], and it sold for $295 US dollars. Others, more worn, look like those in our secondary image and sell for about one-half the value of the CNG specimen.
Approximate catalog values are:
worn: $100 US dollars approximate catalog value
average circulated: $180
well preserved: $350
Tim, please be careful that your medal is not cleaned. If it has be polished up by harsh chemicals, it may look nice to a non-collector, but experienced collectors shun cleaned coins. On the other hand, if your specimen is in great shape, you really have something. Hope you do!