Silver bar from San Francisco Mint
My father was an avid collector of gold and silver currency. This silver bar, with an overstrike in the serial number, was part of his collection, which he acquired the 1960s. I’ve seen previous posts that put the value of silver bars minted at the San Francisco mint from the 1950s at $150-$300 per ounce. Is this still accurate? Also, how does one tell if it’s authentic?