would like to know some history about this

http://www.kitco.com/charts/livesilver.html

I would imagine it to be about 40 years old. That would be the 60's and I can imagine somebody doing the "duck and cover" routine at that time if the provenance and the story is accurate.

But the piece is not a "rare" piece of numismatist value.

I would go at spot plus trade and guess that $160.00 on spot as of the time of the post is fair value if you can get it.