The only true $5 silver strikes were a set of six issued by the Atlantis Casino in the Bahamas. You may be referring to the 1967 Franklin Mint set of 36 which were issued during the greta silver bubble These were issued in Proof (limited to 500) and proof-like. There are also silver $1 tokens issued in 1965 and silver clad $1 tokens isssued in 1966. These were not to be won but actually played. There are also quite a few $5 tokens which were issued occasionally by some casinos. I have three different commmemoratives from the Tropicana Las Vegas and I'm sure there are more. I also have 27 $25 silver tokens from many different casinos. There are several $1 and $5 denominations, also commemoratives, from Colorado. Several casinos in Las Vegas have silver colored, with some gold-plate, tokens which may or may not be silver. These are in addition to the Aladdin Chinese New Year series which is silver.