John, pre year 2000 the $10 strikes from Nevada all were .6. But after year 2000 $10 strikes were lowered to .5 or 1/2 oz. of pure/fine silver. And not all to long ago they were reduced again to clad or basically zero silver. Some non Nevada strikes like cruise ships are labeled HSP which is just like a clad strike. Heavy silver plating.

Dennis
SS-094