I always found these interesting, it's like history now is repeating itself. If you check out Martin Armstrong's blog Armstrong Economics he has very descriptive explanations on the ancient monetary system and how the economics indicators and principles then are still relevant today, and how if we only look back at the what the causations were then we could better appreciate and respect the natural cycles we still see today.
Here are the silvered follii that I have pictures of. I always wondered how they actually silvered them, anyone that knows please share.