Although it looks like the Peso sign I'm not sure it really is. Why would you put the Peso sign in a coin. It probably is something else and du to wear and tear now it looks like a Peso sign. Look at this other coin for example:

http://www.ancientresource.com/images/pirate-shipwreck-treas...

ps: The link to the image you are talking about is:

http://www.ancientresource.com/images/pirate-shipwreck-treas...

And its correct id is:#CS2073