I've been at this a long time, pictured is an ensemble of silver ingots from the United States Mint San Francisco spanning the entire run from the early 1930's to 1960. The Mint status was changed to an Assay Office and later silver ingots were produced under that hallmark.I was very fortunate to have access to a lot of opportunity early on, acquiring examples from older collectors that had not seen much interest in their holdings to that point. +/-15 years ago, there was not much competition to buy these. To date, the 5 oz class ingots remain more desirable that larger counterparts and carry a much higher premium.Over the years, research and writings that I have done have contributed to increased popularity and today, any United States Government silver ingot will be offered with a huge premium. Hope everyone enjoys the picture, it was 15 years in the making! Check out SILVERINGOTS.COM for more on these and other United States Government silver ingotsKen Conaway