The 1917-S Walking Liberty Half Dollar (Reverse Mint Mark) had a mintage of 5,554,000. The composition of these coins is 90% silver, 10% copper. These coins contain .3617 troy ounces of silver, and have a diameter of 30.6mm. We use strict Photograde standards when grading all of our coins. You can view the grading guidelines on the main category page for these Walking Liberty Halves. Please allow 3 to 5 business days for your order to leave our offices.