what do you make of this, page-54

Absolutely. When they were in their plastic cases, you couldn't tell the difference. They were the right size for a one ounce coin, and were marked as .9999 silver, one ounce. But when you took one out, you knew immediately it was the wrong weight. So we did a density check, and it came out at about 7.2 s.g., which is close enough to zinc. They sounded wrong when you clinked them, too. They may have had a verrrrrry thin coat of silver on them.