Current price of silver is $21.81 oz, So that half oz coin is worth $10.90, it dosent matter what it says on it, you can put anything you want on a silver coin, its easy to do and it dosent make it worth anymore, silver is silver. It would be stupid to pay $20 or $30 for a $10 piece of silver.
I'm assuming that these will each be loaded with the private key to 10 LTC - like the Casascius Bitcoins. So $10.90 plus $23.79 plus premium to cover manufacturing costs and some profit for the guy making them. Gotta be looking at around 40 bucks each.