| Country of Origin | United States |
|---|---|
| Denomination | $1 |
| Circulated/Uncirculated | Uncirculated |
| Composition | Copper, Zinc, Manganese, Nickel |
| Year | 2019 |
| Strike Type | Proof |
| Mint Location | San Francisco |
| Grade | Ungraded |
| Variety | Reserve Proof |
| Certification | Uncertified |
Check the listing for details. 2019 American Innovation $1 Reverse Proof Coin-Pennsylvania-US Mint. Made in United States. Listed at 16.99 USD. The reverse design depicts an artistβs conception of the poliovirus at three different levels of magnification along with the silhouette of a period microscope, representing the extensive research that was conducted to develop a cure for polio.