There certainly are some scarce dates/mintmarks in the walking half series. Depending on condition, some are worth some pretty good bucks. Check out the 1921's for example. In the OP's case, his particular coins, in that condition, don't hold any premiums over their silver value.The two coins on top are Walking Liberty Half Dollars. There are no scarce dates in that series. The 1851 is a large cent with the braided hair design. Check under the 51. Do you see 81? Even so, all coins are not worth much.