The author (Tony Chou) expects gold and silver to peak around 2017. For 99 cents (Kindle edition) you can find out why and what he thinks is the smart way to invest in metals.
By the way, he does mention numismatic coins - he doesn't recommend them, of course, but he does mention them.
What does he recommend? Physically backed ETF funds. I don't know that his 2017 peak prediction will be right, but I do agree with him on ETF stocks - if you want to invest in these metals, that's the way to go. Unless, of course, you think the world is going to collapse into chaos, in which case you should be buying junk silver coins and small denomination bullion gold coins - neither of which are recommended by Tony Chou, who suggests guns and food stockpiles instead if you really think that doomsday scenario is possible. I agree with him on that, also.
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Clue for the second 2014 Silver Eagle Giveaway: Goldine, Silver, or Brass: a die gauge between the C and O in Continental identifies these.