Hello @MattM CS - Thank you for your reply.
I admit I am perplexed by the conclusion of the team. Silver stamps are very rare, but they are certainly not unheard of. For example, here is another card from this era which was has a small population of silver stamps despite gold being the standard. The image is attached. Beyond that, different foils on various Prerelease cards featuring stamps are also, such as Prerelease Aerodactyl.
With my Electabuzz card in question, it was never distributed without a stamp. While some extraordinarily rare errors from this set of 4 cards exist with no stamp, the known population of errors printed with no stamp is believed to be in the single digits. So in order for my Electabuzz to be inauthentic, it would mean someone obtained one of the rarest and prestigious Pokémon errors from the era. This card would be worth tens of thousands of dollars. Instead of capitalizing on this, they chose to apply a perfect replica of the ordinary stamp featured on the $5 copy of the card using silver foil instead of gold.
Even with the scarcity of silver stamp variants, the alternate logic that would lead to their fraudulent creation is hard to buy in to. Somebody would have purposefully taken one of the most expensive English cards ever known and compromise it to a slight variation of the most populous English promo card. Unlike Dark Charmeleon or Fossil Aerodactyl, the Electabuzz #2 is not a set card with a novelty stamp applied. The only version of the card that was officially distributed was stamped with gold. Obtaining an unstamped candidate, something most people could never achieve, only to give it a stamp in a slightly different color is a dubious theory.
Could you give me some more information about what was inconclusive about the card I submitted?