Avid Coin Collector

My friend David is an avid coin collector. He took after his dad who is also very passionate in collecting rare and old coins. When his father died, he inherited all of his dad's collection including a kennedy half dollar which was minted in 1964. He also owns some rare gold coins which he hides in his safe. But I think the most interesting coin in his collection are those pirate coins he got from one of his trips. They are still clustered together and according to him it's more valuable that way.