The 1967 could be 50% or 80%... no way to tell except melting it. The others are 80%. Pretty good finds for your silver pile in the US.
“The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.” – George Bernard Shaw. Why Copper Bullion ~~~ Interview with Silver Bullion Producer Market Harmony Passive Income blog