josephrg said:
Unfortunatly I cleaned the coin a little more ( I find a eraser works well on silver coins) and it is a O instead of a D.Any idea on the value since this is a common presentation piece and how about a date? thanks and sorry for the unclear pictures.
Trez said:
Pencil eraser? ok, that will erase it's value some.
Firstly, Trez's attribution of the coin is correct. Beyond that,
For the benefit of anyone else who may be reading this... One should NEVER EVER EVER eraser a coin..... let alone a rather rare $150 400-year old coin!!!

A normal pencil eraser is abrasive, putting down minute scratches on the coin's surface... this leaves an obvious pattern that someone who is familiar with coins would recognize (and lament) right away. It's basically a low-tech form of what coin people call "whizzing".
Not sure if the pics currently posted are before or after you did that (can be hard to see surface issues from a scan)... just don't do it again in the future. W can only hope that the eraser you used was some kind of minimally abrasive type. If the patina was anything close in appearance to normal "old silver" grey w/a touch of brown, though, why did you even try to clean it? There's a saying about coin cleaning... if you have to ask, DON'T DO IT!