Thank you gentlemen for your replies! In response to JKK, from looking up the Lima database here, the 1799 year was the highest mintage out of all the years from 1791 to 1808. Regardless, it could still be counterfeit and I'm just wondering what aspects of the coin make you think so? Unfortunately I don't have immediate access to a scale, but once I do I'll post the value. What weight should I be looking for? And I was only asking if it might be from a shipwreck as it would add to the 'historical value' for me....along with the chipmarks I feel it adds more to the story behind the coin, as in who actually had it in their possesion over the hundreds of years. To me this aspect of collecting is more important than actual value (although that's nice to know too!)
I was tempted to clean it to bring out the oringinal finish, but then came across all the warnings of 'true' collectors that say this only takes away from the coins' value. I don't quite understand this as the coin Powermad5000 posted personally looks much better to me than the one that I have! And also, why would they sell so many different types of coin cleaners if you weren't supposed to? I did read that olive oil can be used as the most 'natural' way of cleaning, but at this point I'm really not sure what to do, as this is the oldest coin that I own.