Silver ingots from the United States Mint Philadelphia are some of the most rare United States Government silver ingots. Production was very limited and according to information passed down over the years, these were not available to the general public. Most of these are dated 1946, one is dated 1956 and one 1960. Other examples and more information is available at SILVERINGOTS.COM Check out the Philadelphia Registry to see just how few of these I have been able to find!Ken Conaway