The Franklin Half Dollar was issued from 1948-63 and was designed by John R. Sinnock, who's initials can be seen below Franklins shoulder. The reverse Liberty Bell design is similar to the one used on the 1926 Sesquicentennial Commemorative Half Dollar, also designed by Sinnock. The half dollar was the last of the circulating coins of the day to change designs from an allegorical figure, such as "Liberty," to a real person.
The Franklin Half Dollar was quite popular and circulated widely, but it's run was cut short after the assassination of President John F. Kennedy and the introduction of the Half Dollar honoring the slain president.
As the price of silver rose in the 1960's and skyrocketed in the late 1970's, millions of these coins were melted for their silver value, a practice which, to a degree, has continued with the dramatic rise in silver prices of the last several years.
Franklin Half Dollars have a composition of 90% silver and 10% copper. Each coin has a weight of 12.50 grams and a diameter of 30.6 mm.