In 1792, the U.S. Mint experimented with silver center cents. Two blanks are on display at the Philadelphia Mint.
OLD MONEY - FLOWING HAIR SILVER CENTER CENT 1792 - Products by Hauley Music
1792 Chain Token, Copper with Silver Center, Circulated
NNC-US-1792-1C-Pattern Silver Center Cent (J-2) - PICRYL - Public Domain Media Search Engine Public Domain Search
Colonial Large Cents Sell for $870,000 - Gainesville Coins News
1792 Birch Cent Penny Could Fetch $2 Million at Stack's Bowers Auction
US Patterns- WHAT U.S. COINAGE COULD HAVE BEEN - Custom Set
1 Cent 1792 Silver Center and Copper (Pattern) - United States – Numista
1792 Silver-Center Cent. Judd-2, Pollock-2. Rarity-7-. Copper, Without Silver Plug. Reeded Edge. Fine Details--Environmental Damage (PCGS).
Two 1-Cent Coins From Early U.S. Sell For Combined $869,500 - CBS Texas