Mother Lode Mint 1oz silver bar
I come across a 1oz silver bar from the Mother Lode Mint. The front has the MLM logo with shovel and pick, 1oz, and .999 fine silver. However, the back side of the bar is blank. I've seen in three different places that this is a rare bar. I can only find one like it on ebay. Can someone tell me if this is truly a rare piece or not. Thanks for your help.