What are the Emergency Production Silver Eagles?

By GovMint :

“Emergency Production” refers to a grading designation given to Silver Eagles that were struck in response to surges in demand or unforeseen circumstances. Such issues are typically struck at different United States Mint facilities than the standard production runs.

For example, in 2021, faced with pandemic-related production slow-downs and expected high demand from collectors during the Covid-19 pandemic, the United States Mint turned to its Philadelphia branch to help produce 2021 Type-1 Silver Eagle bullion coins, which typically would have been struck at the West Point Mint. While these coins do not carry a "P" mint mark, since they are bullion Silver Eagles, the third-party experts at Numismatic Guaranty Company (NGC) were able to certify that they were struck at the Philadelphia Mint via the labeling and markings on sealed monster boxes. NGC felt the particular circumstances of these coins' striking deserved an "Emergency Production" pedigree due to their ties to the COVID-19 pandemic.

Sources Used:

https://www.thesprucecrafts.com/what-are-clad-coins-768418

https://www.usmint.gov/learn/kids/coins-life/coin-composition