Realcent.org

Or, at least, California discovers Balboa. Monday nite half time, and one of the discoveries was an almost totally blackened (it cleaned up okay with Tarn-X) 1962 Medio Balboa from Panama. 90% silver, same weight as our halves. I'd never seen one before, it's actually pretty cool.
Picture is off the internet. http://cgi.ebay.com/Panama-1962-1-2-Bal ... 7316977290

once the largest silver coin was made was a 20 balboa almost 3.87 aprox oz of silver