I recently picked up a 6 bar set, highlighting countries around the world that produce silver. First up, let's look at the back of the bar. It's the same on each of the bars in the set.
The first bar I'll show off is the good ol' US of A. I'm taking these pictures through plastic, because the bars are in sealed plastic. I don't think this is the original packaging, but I guess I can't be for sure.
After researching this a bit, it appears there are two versions of this bar. A serialized set that was sold with a display case, and one without a serial number that was sold individually. Mine is the kind without the serial. It was produced in 1973, and had a mintage of 5000, according to the Kidd book.