By the rim, remember it is in a pcgs slab, it does look to be silver, no clad copper that I can see....but I certainly won't bust it out to find out hmmmm
Oh and fyi it is clad. It's a deep cameo proof. Still great value and great looking coin. Seen them go for 15 up to 30. And by looking at the coin I can tell it is clad...the pure silver are extremely brilliant in color.