Neither silver nor clad. Nickels only had silver in them during WWII, otherwise they are a copper nickel alloy. The term "clad" refers to coins that have a core and outer layers, like a 1965 and newer dime or quarter.
It could have come from a silver proof set but it was not one of the silver coins in the set and without the holder you could never prove provenance not that it would have any bearing on the value unless the TPG's have a new label in the works to fleece the sheeple.
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