2021 Silver Shield Silver Backed Gorilla Proof World War Meme #4 w/ COA

Silver was the original backing of the dollars that we spend today.  So Silver Back (ing) is a bit of word play for the precious metal that so many enjoy collecting.

After the American Revolution, the United States adopted a silver standard based on the Spanish dollar in 1785. This silver standard was legally mandated by the 1782 Mint and Coinage Act, which established the silver United States dollar as the official unit of currency.