Question About 1973-S Ike

I recently read an article about a 1973-S IKE, it is:

Both Lydston's and Wrublewski's coins were struck on copper-nickel clad planchets (outer layers of 75 percent copper, 25 percent nickel, bonded to a core of pure copper), of the kind used for circulation strikes. The coin should have been struck on a silver-copper planchet (80 percent silver, 20 percent copper, bonded to a core of 21.5 percent silver 78.5 percent copper), the sole composition used for collector Uncirculated and Proof versions in 1973.

The weights of both error coins are near the standard 22.68-gram weight of the copper-nickel clad coins instead of the 24.59-gram weight for the silver planchets.

The edges of both Lydston's and Wrublewski's coins exhibit the exposed copper core, instead of the silver edge of the silver coins.

I currently have a 1973-S IKE that weighs 22.4grams. And the edge is about 90% copper. Could this be one also? It is a proof.