I have a 3 x 5 card (with a 1970 5 Shillings Somalia coin stapled on and pictured) titled - Silvertowne
On the reverse of the card,
"THE COIN REPRESENTED ON THIS CERTIFICATE IS GUARANTEED TO BE GENUINE BY Silvertowne
I guessing that Silvertowne
was one of the original coin companies that began to address the problem of counterfeit coins back in the 1970's.